分数混合运算专项练习430题(有答案)

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分数混合运算专项练习430题

(1)+× (6)2﹣÷﹣

(2)×﹣×

(3)3 (4)

﹣(

+)

(5)

.

÷8+×

7)

8)÷+×

9)×+×

10)12×(75%+)

((((

.

(11)20÷÷. (17)

(12)﹣﹣+ (13)87× (14)÷5+5÷ (15)÷(﹣×) (16) .

18)

19)÷(﹣)÷,

20)〔+(﹣)〕÷,21)42÷(÷),

22)(﹣)÷,

(((

((.

(23)×+÷3, (29)(+)×32,

(24)12×(÷), (25)×7+×7, (26)9×÷9×,

(+

)÷,(27)

×19﹣

(28)

.

30)÷÷,

31)×87+12÷,

32)48×(),33)÷[×()],34)[1﹣()]×,(((

.

(35), (40)+÷+,

(36)

(37)

(38) (39)

.

41)÷7+×,

42)2﹣÷﹣,43)

×(+)+,

×

+×,

44)

((

(.

(45)3﹣﹣, (50)(﹣)×100

(46)×+÷5, (47)(﹣)÷+, (48)+(+)×,

(49)×÷(﹣), .

51)×+×,

52)×+÷,

53)(12×﹣7.3)÷,

54)÷〔(+)×],55)(×27﹣)×,((((

.

(56)××18×

×(+)+

(62)

(57)×13+×27

(58)+×5+×2

(59)7×13×(﹣) (60)

×40

÷++

(61)

.

78×63)

÷(+

64)

65)×÷,

66)÷( +),

67)×7+×11,

(((((.

(68), (74)+×,

(69)(15+)×, (70)﹣×, (71)13×+×15, (72)87×,

(73)××32,

.

75)×0.25+×,

76)25×××,

77)3÷﹣×,

78)÷[(+)÷],

÷7×,

79)

((((

(.

×4

,(86)×25×40×,

(80)

×

﹣×,(81)

(1﹣×)×,(82)

(83)

×

×,

(84)

(85)×72﹣×23, .

87)﹣(+)

88)+(+)

89)﹣(﹣)

90)1﹣﹣.

91)0.25×19+5×

(((((.

(92)×13×30 (98)3﹣1﹣,

(93)×+×+ (94)×7.6+2.4×0.6. (95)(﹣)×36, (96)×32×, (97)×﹣×,

.

99)÷÷,

100)[4﹣(﹣)]×,

101)20×+4×,

102)÷+4×,

103)23.6×10%+13.6×910%,(((((

.

(104)(﹣)××8, (110)15﹣5÷12﹣,

(105)++, (106)10﹣﹣, (107)+﹣+; (108)0.25+++, (109)3﹣﹣﹣, .

111)15×÷

112)30×(+﹣)

113)×+40%×

114)10﹣(+×2)

115)+×﹣

(((((

.

(116)[(﹣1)÷]× (122)(2﹣+)×12,

(117)12×(+), (118)×÷×, (119)1×+÷, (120)(++)÷, (121)×+×, .

123)×+×,

124)6×××25,

125)﹣×+,

126)16××(9×),

127)×[﹣()],(((((

.

(128)6×+3.5, (134)18﹣18×,

(129)×÷, (130)+(+)×, (131)÷7+×,

(132)7﹣, (133)++, .

135)+÷,

136)36×( +)

137)8×(36×125)

138)﹣×+

139)〔1﹣(﹣)〕÷(((((

.

(140)×+× (146)0.625×36+×36﹣36,

(141)87× (142)×7+3×25%﹣ (143)(﹣40%)÷× (144), (145)[1﹣()], .

147)(+++)×,

148)+++++++,149)÷28,

150)×,

151)÷,

((

(((.

(152)16×, (158)×8÷

(153)÷[(+)×] (154)36×××42 (155)(+)÷ (156)×+× (157)÷÷ .

159)160)[1﹣(+)]÷,161)(﹣)×45,

162)÷﹣×,

163)÷7+×,

(((.

(164)×9+, (170)18×(+﹣),

(165)2﹣÷﹣, (166)(+)×24, (167)100﹣23.75﹣76, (168)3÷+3÷, (169)7+8.9+2+6.1, .

171)+++,

172)﹣﹣,

173)×[÷(﹣)],174)48×+3÷7,

175)﹣(﹣),

(((

((

.

(176)+﹣, (182),

(177)﹣(+), (178)15﹣5÷12﹣, (179)﹣+﹣, (180)++, (181), .

183),184),

185)12×(+)

186)24×﹣

187)×÷

((((.

(188)86× (194)×(÷)

(189)×+÷7 (190)÷(+) (191)÷5+×,

(192)(﹣)÷, (193)(﹣)×(+), .

195)+÷

196)÷[1﹣(﹣)]

197)4÷1.25÷8

198)×+×

199)﹣﹣,

(((((.

(200)2﹣﹣, (206)÷7+×,

(201)﹣(﹣), (202)+(﹣), (203)+(+×), (204)÷[×(+)], (205)(﹣)÷, .

207)×÷,

208)36×(+﹣),

209)×58+42÷8,

210)4﹣﹣,

211)(15﹣14×)×,(((((

.

(212)÷﹣÷, (218)1.75×+×+,

(213)24×(+), (214)(×)÷, (215)(+)×9×17, (216)÷×, (217)3﹣1÷(+×), .

219)87×

220)×÷

221)24×(++)

222)÷5+×

223)×0.375÷

(((((.

(224)(﹣)×(+) (230)6﹣2+1,

(225)÷++

(226)3﹣×﹣ (227)÷[1÷(﹣)] (228)÷13+×, (229)×÷×, .

231)5×32×12.5,

232)×,

233)()×(1+),234)()×+,

235)32﹣17.5﹣2.5,

(((

((

.

(236)×55, (242)﹣÷×,

(237)+5××5, (238)(﹣)×8÷, (239)÷7+×, (240)120÷[﹣(1﹣)], (241)(﹣)÷, .

243)÷[()×],

244)(9)×2

245)11

246)(3)÷3247)

((((

(.

(248)×(﹣) (254)24÷6,

(249)4×[(+)÷6] (250)×+÷15 (251)(6﹣×32)+ (252)÷﹣÷. (253)12﹣5﹣4, .

255)1×7÷1×7,

256)()×35,

257)4×××,

258),259) +×+,

((((

(.

(260)26×(﹣)÷, (266)20÷[1﹣(+)],

(261)(﹣+)÷, (262)×+×+3÷19,

(263)÷+×, (264)(﹣+)×24, (265)×+1.25×+125%, .

267)[2﹣(﹣1.5)÷]×,268)540÷12×9+482

270)(),

271)75%×2.5,

272),

((((.

(273)2÷(2.2+0.2)6.9, (279)3﹣÷﹣,

(274)0.5, (275), (276), (277), (278)()×24, .

280)×+÷7,

281)19÷[(+)×],

282)[7.8+×(2.75+1.25)],283)[()÷],

284)÷×,

(((

((.

(285)(7.5+35×)÷, (291)(﹣)÷+,

(286)×6.3﹣×4.9, (287)[+(﹣)]÷40%, (288)12+× (289)(2.9+3.1)×﹣2 (290)2×﹣. .

292)19÷(+),

293)55÷11,

294)0.6×+60%×+×,295)(+﹣)×24,

296)5×(+)﹣,

(((

((

.

(297)﹣(), (303)1﹣,

(298)++, (299)﹣+, (300)1﹣﹣ (301)﹣﹣, (302)+(﹣

),

.

304)(),

305)4÷÷,

306)2,

307)98÷(),308)24+24×,((((

.

(309)(+)×48, (315)(﹣×)÷,

(310)12÷25, (311)÷, (312)÷23+×, (313)÷÷, (314)×3÷, .

316)(+)×32,

317)×+×,

318),

319)88×(+),

320)××16,

(((((.

(321)+×, (327)×+÷,

(322)44﹣72×, (323), (324)×16×, (325)÷12÷, (326)÷[(﹣)×24], .

328)++×,

329)÷(+),

330)(330),331)(25+)×4,

332)(15﹣14×)÷,(((

((

.

(333)()×8÷, (339)(﹣+)×84+101,

(334)+1÷(﹣), (335)(+﹣)×24, (336)+(﹣)×, (337)0.625×9.6+62.5%×, (338)9+99+999+9999+×4, .

340)3.5×1+0.35×10+2×350%,

341)[2+(3.4﹣2)×4.5]÷1,342)

343)

344)

((

(((.

(345) (351)

(346)6﹣×﹣ (347)〔1﹣(﹣)〕÷ (348) (349) (350)5+3.6×2.5÷0.48

.

352)

353)

354)3.6×2÷16.9÷(3×1.1 6)×1.3

355)+++…+

356)÷×,

(((((

.

(357)(﹣+)×12, (363)×÷(﹣),

(358)7×÷7×, (359)1.5×﹣×, (360)(﹣)÷, (361)×+÷, (362)7÷﹣÷7, .

364)×3.6+5.2×0.5+1.2×50%,365)[﹣(+)]÷,

366)11.32﹣(7+1.32),

367)89×,

368)÷÷,

((((.

(369)÷4×, (375)0.42×1+3,

(370)÷+×, (371)÷[﹣(﹣)], (372)×(+)÷, (373)[﹣(+)]÷, (374)(﹣+)×42, .

376)1÷3.6×,377)15×7+3÷,378)3﹣×3.6,

379)×1÷3,

380)0.44+++0.6,(

(((

.

(381)+2×2﹣2÷, (387)25××=;

(382)(4﹣2)÷(1+2.4), (383)48200﹣156×720÷39,

(384)(3.06÷0.25+2.76)×0.2,

(385)[3÷(3﹣2.4×)]×0.2, (386) +﹣, .

388)××=;

389)÷6÷

390)×÷,

391)15÷×,

392)﹣+,

(((((.

(393)+﹣, (399)÷+×,

(394)﹣(+), (395)+++, (396)×÷×, (397)×13﹣, (398)÷〔×(1﹣)〕,

.

400)﹣﹣,

401)﹣÷,

402)÷÷,

403)(+)×,

404)13.2÷(3.2×3﹣0.8),(((((

.

(405)÷[(﹣)×12], (411)×+×,

(406)×45+÷, (407)﹣×, (408)(+)÷, (409)(×+)÷(11﹣), (410)×××, .

412)÷[(+)×],413)(+×)÷,

414)÷+×,

415)+×+,

416)(﹣)÷,

((((

.

(417)÷(﹣) (423)×﹣÷,

(418)×[﹣(﹣)] (419)÷[×(+)] (420)÷+× (421)5.58﹣+5.42﹣ (422)999+99+9+. .

424)1﹣÷﹣,

425)÷﹣÷,

426)(+×)÷,427)÷+×,

428)×(+)+,(((

((

.

(429)+,

(430)44,

.

.

分数混合运算专项练习430题参考答案:

(1)+

×

=×+×, =(

+

)×,

=1×, =; (2)×﹣×

=﹣, =﹣,

=

(3)3

=

××3, =12; (4).

=1.6×,

=3.

﹣(

+) (5)=﹣ =﹣

=1

(6)2﹣÷﹣ =2﹣(×﹣) =2﹣()

=2﹣1 =1;

÷8+×

(7)

.

=×+×

=(

+

)×

=1× =. (8)÷

=×+,

=,

=

(9)×+× =(+

)×,

=1×,

=

; (10)12×(75%+) =12×(+), =12×+12×, =9+10, =19;

(11)20÷÷. =20××,

=20×(×), =20×, =30 (12)﹣﹣+,=(

+)﹣(+),=2﹣1, =1;

(13)87×, =(88﹣1)×,

=7﹣, =

(14)÷5+5÷, =×+5×, =+9, =

(15)÷(

﹣×),=÷(

﹣),

=×, =

(16)

=+﹣ =1﹣ =; (17)

=++ =++ =1+ =1;

(18)

=

+

+(﹣)

=1+(﹣) =1+ =1.

(19)÷(﹣)÷,

=÷(﹣)÷,

=÷÷, =××3,

=5; (20)〔+(﹣)〕÷,=〔+(﹣

)〕÷,

=〔+〕÷, =〔

+

〕÷,

=÷, =×, =

(21)42÷(÷),

=42,

=15;

(22)(﹣)÷, =, =;

(23)×+÷3, =×(), =×1, =;

.

.

(24)12×(÷), =12×,

=56;

(25)×7+×7, =(+)×7,

=1×7, =7;

(26)9×÷9×,

=1÷9×, =×, =

(+

)÷

(27)=÷, =×,

=;

×19﹣

(28)=×(19﹣1),

=

×18,

=13;

(29)(+)×32, =×32+×32, =24+20, =44;

(30)÷÷,

=××,

=;

(31)

×87+12÷

,=×87+12×,

=×(87+12), =

×99,

=27. (32)48×(),

=48×

﹣48×

+48×,

=22﹣20+18, =20;

(33)÷[×()],

=÷[×], =÷, =2; (34)[1﹣()]×, =[1﹣]×,

=×, =;

(35)

=24×+56×,

=(24+56)×, =80×, =30 (36)

=×+×, =(

+

)×,

=1×,

=;

(37)

=1÷, =; (38)

=96×,

=21; (39)

=(86+1)×, =86×+,

=85+,

=85

(40)+÷+, =++, =+(+),

=+1,

=1;

(41)÷7+×

=×+×

=()×,

=×, =

(42)2﹣÷﹣,

=2﹣, =2﹣(),

=2﹣2, =0; (43)

×(+)+,

.

.

=×+×

+, =2+

, =2+(),

=2+2, =4

×

+×,

(44)=×(+), =

(45)3﹣

=3﹣(

+

), =3﹣1, =2; (46)

×+÷5, =

×+×, =×(

+),

=;

(47)(﹣)÷+,

=

×2+,

=+,

=1;

(48)+(+)×,=+×,

=+, =

(49)×÷(﹣

),=×÷

=××,

=

(50)(﹣)×100, =×100﹣×100,

=75﹣12, =63;

(51)×+×,

=×(+

),

=×2, =; (52)×+÷,

+×, =(+)×,

=1×,

=

(53)(12×﹣7.3)÷, =(10﹣7.3),

=2.7×, =1.2;

(54)÷〔(+

)×],=÷〔×〕, =×, =; (55)(

×27﹣

)×

,=[(×(27﹣1)]×. =[

26]×

=18×, =7 (56)××18× =(

×

)×(18×

),

=×1,

=;

(57)×13+×27

=(13+27)×,

=40×, =30;

(58)+×5+×2 =(1+5+2)×, =8×, =5;

(59)7×13×(﹣)

=7×13×﹣7×13×,

=104﹣98, =6; (60)×40

=×(39+1),

=

×39+

=38+

=38

÷++

(61)=×++ =++ =1+

.

.

=;

×(+)+

(62)=

++

=2+

=2+(

=2+

=2+

=

; 78×

(63)=(79﹣1)×

=79×﹣1×

=3﹣

=

÷(+

(64)=÷()

=

÷

=

=

(65)×

÷,

×,

=×(

×

),

=×, =1;

(66)÷( +), =÷,

=;

(67)×7+×11, =×(7+11), =×18,

=10; (68)

=[1﹣]÷, =÷, =.

(69)(15+)×

=15×

=2+

, =2

(70)﹣

×,

=(1﹣

), =

29?916 =18; (71)13×+

×15,

=

×(13+15), =28,

=6; (72)87×, =86×+1×,

=3, =3

(73)××32, =(

4)×(

8),

=5×1, =5;

(74)+×, =, =3

(75)×0.25+×, =×+×,

=(

)×,

=1×, =;

(76)25×××, =(25×)×(×),=10×,

=1;

(77)3÷﹣×,

=6﹣×,

=6﹣, =5

(78)÷[(+)÷],=÷[

÷],

=÷, =1

÷7×,

(79)=×,

.

.

=;

×4

(80)=30×,

=

×

﹣×

(81)=0;

(1﹣×)×,

(82)

=(1﹣)×,

=;

(83)=﹣, =2,

×

×

(84)=

(85)×72﹣×23, =(72﹣23)×,

=49×, =35; (86)×25×40×, =(

40)×(25×

),=22×9, =198.

(87)﹣(+) =﹣, =

(88)+(+) =++,

=1+, =1; (89)﹣(﹣)

=

+

﹣,

=1﹣, =;

(90)1﹣﹣. =﹣,

=

(91)0.25×19+5× =×19+5×, =×(19+5), =×24, =6; (92)

×13×30

=

×30×13,

=4×13, =52;

(93)×+×+ =×+×+, =×(+)+, =+, =1;

(94)×7.6+2.4×0.6.=0.6×7.6+2.4×0.6, =0.6×(7.6+2.4), =0.6×10, =6

(95)(﹣)×36, =

×36,

=20;

(96)×32×, =×4×8×, =,

=3×5, =15. (97)×﹣

×, =,

=, =

(98)3﹣1﹣,

=3﹣(1+

),

=3﹣2, =1;

(99)÷÷, =×,

=;

(100)[4﹣(﹣)]×,=[4﹣]×,

=,

=

(101)20×+4×,

=(20+4)×,

=24×,

=14;

.

.

(102)÷+4×, =×4+4×, =(+)×4, =1×4, =4;

(103)23.6×10%+13.6×910%,

=2.36+123.76, =126.12;

(104)(﹣)××8,

=××8,

=

(105)++,

=+(+

),

=+1, =1

(106)10﹣

﹣,

=10﹣(+

),

=10﹣1, =9;

(107)+﹣+;

=(﹣)+(+), =+1, =1; (108)0.25+

++

, =(0.25+0.75)+(+),

=1+1, =2;

(109)3﹣﹣﹣,

=(3﹣)﹣(+), =2﹣1, =1;

(110)15﹣5÷12﹣,

=15﹣(+

),

=15﹣1, =14

(111)15×÷

=15××

=2;

(112)30×(+﹣

)=30×+30×﹣30×

=12+5﹣8 =9; (113)×

+40%×

=×(+

=×1 =;

(114)10﹣(+×2) =10﹣(+) =10﹣1

=8; (115)+×

=+﹣ =

(116)[(﹣1)÷]× =[]×

=1× =1

(117)12×(+), =12×+12×, =9+6, =15;

(118)×÷×, =÷×, =×, =;

(119)1×+÷, =1+, =1

(120)(++)÷, =(++)÷, =(2+)×7, =2×7+×7, =14+2, =16;

(121)×+×, =×(+), =×1, =;

(122)(2﹣+)×12,

.

.

=2×12﹣×12+×12, =24﹣+10, =22+10, =32;

(123)×+×,

=×(+),

=×1,

=;

(124)6×××25,

=(6×)×(25×), =1×10, =10;

(125)﹣×+,

=×(1﹣)+,

=×+,

=+,

=

(126)16××(9×), =16××,

=12;

(127)×[﹣()],=×[],

=×,

=;

(128)6×+3.5

=6.5×+3.5×, =(6.5+3.5)×, =6.

(129)×÷,

=××

×,

=×,

=;

(130)+(+)×

,=+

×

=+, =

; (131)

÷7+×

=

×+×

, =(

+

)×, =1×,

=. (132)7﹣,

=7﹣(),

=7﹣1, =6;

(133)++,

=(

)+,

=1;

(134)18﹣18×,

=18﹣3, =15;

(135)+÷, =+×, =,

=.

(136)36×( +)

=36×+36×,

=8+21, =29;

(137)8×(36×125) =8×125×36, =1000×36, =36000; (138)﹣×+ =﹣+, =;

(139)〔1﹣(﹣)〕÷

=(1﹣)÷,

=÷,

=2 (140)×+×

=(

+

)×,

=1×,

=; (141)87× =(86+1)×, =86×+,

=3+, =3

.

.

(142)×7+3×25%﹣ =×7+3×﹣, =(7+3﹣1)×,

=10×,

=;

(143)(﹣40%)÷×

=(1.4﹣0.4)××,

=1××,

=

(144)

=×+×,

=(+)×,

=1×,

=;

(145)[1﹣()]

=[1﹣]×4,

=×4,

=;

(146)0.625×36+×36﹣36,

=(0.625+0.375﹣1)×36, =0×36, =0; (147)(+++)×,=[(+)+(+

)]×

,=[1+1]×, =2×

=;

(148)++

+

+

+

+

+

=1﹣+﹣+﹣+﹣+﹣+

﹣+﹣+﹣,

=1﹣,

=.

(149)

÷28,

=

×

, =

; (150)

×

=;

(151)

÷

=

×

, =;

(152)16×

=

(153)÷[(+)×

]

=÷{

×

}

=3.

(154)36×××42

=(36×)×(×42)

=×12 =30;

(155)(+)÷

=×+

×

=2+1 =3;

(156)×+× =×(+)

=×1

=;

(157)÷÷

=1

=1;

(158)×8÷

=

=

(159)

=24×+24×+24×

=8+9+14 =31

(160)[1﹣(+)]÷,=[1﹣]×4, =×4, =1;

(161)(﹣)×45,

=×45﹣×45, =15﹣9,

.

.

=6; (162)÷﹣

×,

×,

=()×,

=1×,

=;

(163)

÷7+×,

=

×

×

=(

)×,

=

×,

=

(164)×9+,

=7+,

=7;

(165)2﹣

÷

﹣,

=2﹣

×

=2﹣(+),

=2﹣2, =0 (166)(

+)×24,

=

+×24+×24,

=12+8+4, =24;

(167)100﹣23.75﹣76,=100﹣(23.75+76.25),

=100﹣100,

=;

(168)3÷+3÷, =3×+3×,

=3×(

),

=, =

(169)7+8.9+2+6.1,

=(7+2)+(6.1+8.9),

=10+15, =25;

(170)18×(+﹣),

=18×+18×﹣18×,

=6+10﹣3, =13; (171)+

+

+

=,=

=

(172)﹣

=﹣(), =﹣1,

=;

(173)×[÷(﹣)],

=×[÷],

=

×,

=;

(174)48×+3÷7,

.

=48×, (182), =85×+1×

=(48+1)×, =49×, =21.

(175)﹣(﹣),

=﹣,

=

(176)+﹣,

=﹣, =;

(177)﹣(+),

=﹣,

=

(178)15﹣5÷12﹣

=15﹣﹣,

=15﹣(+),

=15﹣1, =14;

(179)﹣+﹣,

=(+)﹣(+), =1﹣1, =0;

(180)++,

=.

(181),=÷,

=

.

=(+)×, =×+×

=+1, =1

(183)

=(﹣

)×24, =×24﹣×24,

=15﹣10, =5; (184)

,=×21+×21,

=(+)×21,

=1×21, =21

(185)12×(+)

=12×+12×

=8+2 =10; (186)24×

=

=2

(187)

×

÷

=

×

×

=;

(188)86×

=(85+1)×

=4+

=4

(189)×+÷7

=×+× ,

=(+)×

=

(190)÷(+) =÷

=

(191)÷5+×, =×+×, =(+)×, =1×, =;

(192)(﹣)÷

=; (193)(﹣

)×(+),=

×,

=

(194)×(

÷)

=×,

.

=; (195)+÷

=+, =2;

(196)÷[1﹣(﹣)]

=÷[1﹣],

=,

=

(197)4÷1.25÷8 =4÷(1.25×8), =4÷10, =0.4; (198)×+

×

=(

+

)×,

=1×,

=;

(199)﹣﹣,

=﹣(+),

=﹣,

=﹣,

=

(200)2﹣﹣,

=2﹣(+

),

=2﹣1, =1; (201)﹣(﹣),

=

+,

=;

.

(202)+(﹣), =+,

=

(203)+(+×), =+(+),

=()+,

=1+,

=1;

(204)÷[×(+)],=

÷[×+×],

=

÷[],

=

×,

=;

(205)(﹣)÷,

=(﹣)×,

×,

=

, =;

(206)

÷7+×

=

×+×

=()×,

=

×,

=

(207)×÷,

=,

=;

(208)36×(+﹣), =36×+36×﹣36×, =24+6﹣27, =30﹣27, =3;

(209)×58+42÷8,

=(58+42)×,

=100×,

=12.5; (210)4﹣

=4﹣(),

=4﹣1, =3;

(211)(15﹣14×)×,=(15﹣8)×,

=7×,

=2;

(212)÷﹣÷, =

, =

(213)24×(+), =24×+24×, =9+18, =27; (214)(

×)÷, =(﹣)÷,

=×, =; (215)(+

)×9×17, =×9×17+×9×17,

=6+, =

(216)÷

×,

=

×

×,

=;

(217)3﹣1÷(+×), =3﹣1÷1, =2;

(218)1.75×+×+,

=×+×+, =×(++1),

=×,

=

(219)87× =(86+1)× =86×+1×

=3+ =3

(220)×÷

=

×

=;

.

.

(221)24×(++) =24×+24×+24×

=9+4+10 =23;

(222)÷5+× =×+× =(+)×

=1× =;

(223)×0.375÷ =×÷ =

÷ =

(224)(﹣)×(+)=× =

(225)÷++ =×++, =++, =1;

(226)3﹣×﹣

=3﹣﹣,

=3﹣(+), =3﹣1, =2;

(227)÷[1÷(﹣

)]

=÷[1÷()],

=÷[1÷],

=×,

=

(228)÷13+×,

, =(+)×,

=1×,

=

(229)×÷×, =×××, =

(230)6﹣2+1, =3+1, =5;

(231)5×32×12.5, =5×4×8×12.5, =(5×4)×(8×12.5), =20×100, =2000 (232)

×

=

=

(233)(

)×(1+),=()×, =

×,

=

(234)()×+, =×,

=,

=;

(235)32﹣17.5﹣2.5,

=40﹣20, =20; (236)×55

=10+15, =25; (237)+5×

×5,

=×(1+5+5), =×11,

=5 (238)(﹣)×8÷,

=

×8×6,

=9; (239)÷7+×

=×+×,

=(

+

)×,

=1×,

=;

(240)120÷[﹣(1﹣)],=120÷[

+

﹣1],

=120÷311,

=440;

(241)(﹣)÷

=(﹣)×

.

.

=×﹣×, =﹣, =1;

(242)﹣÷×,

=﹣××,

=﹣,

=

(243)÷[()×

],

=÷[

×

],

=

=3 (244)(9)×2

=(

)×﹣,

=37×(﹣)×﹣,

=37×

×﹣,

=﹣, =

(245)11

=

××

×, =

×

×

×

, =1; (246)(3

)÷

3

=(

+

)×

=(+﹣﹣)×,

=

(247)

=; (248)×(

﹣)

=×(

),

=

=

(249)4×[(+)÷6] =4×[(

)×],

=4×[×], =4×, =1; (250)×

+÷15 =×+×, =()×,

=1×,

=

(251)(6﹣×32)+ =(6﹣4)+,

=2+,

=2;

(252)÷﹣÷.

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