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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