分数混合运算简算练习
一.计算题(共30小题)
1.怎样简便就怎样算.
2.能简算的要简便运算
(﹣)× (1﹣×)÷ ×+25%×.
3.能简便计算的要简便计算.
4.下面各题,怎样简便就怎样算
5.脱式计算,能简便的要简便计算
6.下面各题,怎样简便就怎样算.
÷7+× ×+÷
7÷[1÷(4﹣)] +÷+.
7.下面各题能简算的要简算.
8.计算下面各题,能简算的要简算.
×[+(﹣ )] ×9.3+9.3×2.25
(+)×8+ 36×(+﹣)
9.怎样简便怎么计算.
10.简便计算.
÷(+) ×0.75+× (+)÷
0.575×19+1.9×4.25 ×+0.375×2﹣3÷
(++)÷(++) 33÷+×44+24÷﹣0.6.
11.计算下面各题,能简便要简算,并写出过程
55÷[(﹣)×] ×39+
36×(+﹣) 98×0.2﹣89×+41×.
12.怎样算简便就怎样算
13.计算下面各题,能简便要用简便方法.
×0.375÷ ÷(3﹣﹣) (0.75﹣)×(+)
48×(﹣+) ÷9+× 87×.
14.计算下列各题,能简算的要简算.
(﹣)×45 (+)×(1﹣)
4×0.8×2.5×12.5 ×÷×.
15.下面各题怎样简便就怎样算.
16.我会算(能简算的要简算):
×99+ 24×(﹣+) 3.7×+2.3÷
19× 26÷÷ ÷(+)
17.计算下列各题,(能简算的要简算)
18.用简便方法计算下面各题.
19.下面各题,怎样算简便就怎样算:
÷(﹣)× ×(+)+
÷+× [﹣(﹣)]÷.
20.用脱式计算(能简算的要简算).
21.怎样简便就怎样算
2﹣×﹣ 2.5×9×1.25×4×8
×47+×47+47÷ 1110÷[56×(﹣)].
22.下面各题怎样算简便就怎样算.
①3.2﹣1.05×0.6 ②4×125×8×25 ③6.78×8.5+6.78×1.5
④(87﹣75)÷2×1.5 ⑤÷[1﹣(+)].
23.下面各题怎样简便怎样算.
7×(+)×11 48×﹣35÷ 4.54+9.99×999+5.45.
24.计算下面各题,(能简算的要简算).
×(﹣) ÷+×6
12.05﹣2.56﹣5.44 ﹣(﹣)×2.
25.递等式计算(能简算的要简算).
0.125×0.25×32 ×+÷ 6.6×12+0.8×66
8.05﹣375%﹣ ( ﹣+)× 21.57﹣(2.57+3.38)﹣2.62.
26.计算下列各题,能简算的要简算.
﹣×﹣= +×+= ÷2+2÷=
30×(+)= ÷+×= ×+×=
27.计算,能简算的要简算.
28.计算下面各题(能简算的要简算)
×﹣÷ ÷[(+)×2] ×3.2+5.6×0.5+1.2×50%
29.怎样简便就怎样算
2017年09月21日数学的小学数学组卷
参考答案与试题解析
一.计算题(共30小题)
1.怎样简便就怎样算.
【解答】解:(1)(+)×32
=×32+×32
=24+20
=44;
(2)×+×
=×(+)
=×1
=;
(3)﹣×
=×(1﹣)
=×
=;
(4)××
=××
=×
=;
(5)(+﹣)×36
=×36+×36﹣×36
=27+30﹣21
=57﹣21
=36;
(6)××
=××
=×
=.
2.能简算的要简便运算
(﹣)×
(1﹣×)÷
×+25%×.
【解答】解:(1)(﹣)×
=×﹣×
=﹣
=;
(2)(1﹣×)÷
=(1﹣)÷
=÷
=;
(3)×+25%×
=×+×
=(+)×
=1×
=.
3.能简便计算的要简便计算.
【解答】解:(1)×+÷4
=×+×
=×(+)
=×1
=
(2)÷(+)
=÷
=
(3)(+)÷
=÷+÷
=16+15
=31
(4)59×+59×
=59×(+)
=59×1
=59
(5)98×
=(97+1)×
=97×+
=1+
=1
(6)58×﹣×31
=(58﹣31)×
=27×
=15
4.下面各题,怎样简便就怎样算
【解答】解:(1)101×﹣
=(101﹣1)×
=100×
=28;
(2)(+)×54
=×54+×54
=42+10
=52;
(3)60×[÷(﹣)]
=60×[÷]
=60×8
=480;
(4)×+×
=×(+)
=×
=;
(5)÷+×
=×+×
=(+)×
=1×
=;
(6)(+ )÷
=÷
=.
5.脱式计算,能简便的要简便计算
【解答】解:(1)27×﹣11
=15﹣11
=4;
(2)﹣+﹣
=(+)﹣(+)
=1﹣1
=0;
(3)﹣+
=+
=;
(4)+×16
=+12
=12;
(5)+++
=(+)+(+)
=1+
=1;
(6)×4+×4
=(+)×4
=×4
=.
6.下面各题,怎样简便就怎样算.
÷7+×
×+÷
7÷[1÷(4﹣)]
+÷+.
【解答】解:①÷7+×
=×+×
=×(+)
=×
=
②×+÷
=+×
=+2
=
③7÷[1÷(4﹣)]
=÷[÷(﹣)]
=÷[÷(﹣)]
=÷[÷]
=÷[×]
=×
=
=
④+÷+
=+×+
=+(+)
=+1
=
7.下面各题能简算的要简算.
【解答】解:(1)34﹣34×
=34×(1﹣)
=34×
=1
(2)÷×
=×
=1
(3)÷3+×
=×+×
=(+)×
=×
=
(4)2﹣÷﹣
=2﹣﹣
=2﹣(+)
=2﹣2
=0
(5)(+﹣)×25
=×25+×25﹣×25
=20+27.5﹣3
=44.5
(6)101×
=(100+1)×
=100×+
=12+
=12
8.计算下面各题,能简算的要简算.
×[+(﹣ )]
×9.3+9.3×2.25
(+)×8+
36×(+﹣)
【解答】解:(1)×[+(﹣ )]
=×[+]
=×1
=;
(2)×9.3+9.3×2.25
=0.75×9.3+9.3×2.25
=(0.75+2.25)×9.3
=3×9.3
=27.9;
(3)(+)×8+
=×8+×8+
=6++
=6+(+)
=6+1
=7;
(4)36×(+﹣)
=36×+36×﹣36×
=12+30﹣27
=15.
9.怎样简便怎么计算.
【解答】解:(1)×﹣÷
=×﹣×
=(﹣)×
=2×
=;
(2)(+×)÷
=(+)÷
=÷
=;
(3)56×
=(55+1)×
=55×+1×
=28+
=28;
(4)0.24×58+2.4×4.1+0.24
=0.24×58+0.24×41+0.24
=0.24×(58+41+1)
=0.24×100
=24;
(5)1﹣﹣
=1﹣(+)
=1﹣
=;
(6)÷+×
=×+×
=×+×
=×(+)
=×1
=.
10.简便计算.
÷(+)
×0.75+×
(+)÷
0.575×19+1.9×4.25
×+0.375×2﹣3÷
(++)÷(++)
33÷+×44+24÷﹣0.6.
【解答】解:(1)÷(+)
=÷
=;
(2)×0.75+×
=(+)×
=1×
=;
(3)(+)÷
=(+)×
=×+×
=+1
=1;
(4)0.575×19+1.9×4.25
=5.75×1.9+1.9×4.25
=(5.75+4.25)×1.9
=10×1.9
=19;
(5)×+0.375×2﹣3÷
=×+0.375×2﹣3×
=×(+2﹣3)
=×0
=0;
(6)(++)÷(++)
=(++)×5÷(++)
=(++)÷(++)×5
=1×5
=5;
(7)33÷+×44+24÷﹣0.6
=33×+×44+24×﹣0.6
=(33+44+24﹣1)×
=100×
=60.
11.计算下面各题,能简便要简算,并写出过程
55÷[(﹣)×]
×39+
36×(+﹣)
98×0.2﹣89×+41×.
【解答】解:(1)55÷[(﹣)×]
=55÷[×]
=55÷
=220;
(2)×39+
=×(39+1)
=×40
=30;
(3)36×(+﹣)
=36×+36×﹣36×
=27+24﹣21
=30;
(4)98×0.2﹣89×+41×
=98×﹣89×+41×
=(98﹣89+41)×
=50×
=10.
12.怎样算简便就怎样算
【解答】解:(1)×+÷6
=×+×
=(+)×
=1×
=;
(2)÷×÷
=××÷
=×÷
=×4
=;
(3)24××
=24××
=14×
=10;
(4)(+)×24
=×24+×24
=16+4
=20;
(5)1﹣÷
=1﹣×
=1﹣
=;
(6)56×
=(57﹣1)×
=57×﹣1×
=17﹣
=16.
13.计算下面各题,能简便要用简便方法.
×0.375÷
÷(3﹣﹣)
(0.75﹣)×(+)
48×(﹣+)
÷9+×
87×.
【解答】解:(1)×0.375÷
=××
=×
=
(2)÷(3﹣﹣)
=÷[3﹣(+)]
=÷[3﹣1]
=÷2
=
(3)(0.75﹣)×(+)
=×
=
(4)48×(﹣+)
=48×﹣48×+48×
=16﹣24+12
=4
(5)÷9+×
=×+×
=×(+)
=×1
=
(6)87×
=(86+1)×
=86×+1×
=3+
=3
14.计算下列各题,能简算的要简算.
(﹣)×45
(+)×(1﹣)
4×0.8×2.5×12.5
×÷×.
【解答】解:(1)(﹣)×45
=×45﹣×45
=15﹣9
=6
(2)(+)×(1﹣)
=×
=
(3)4×0.8×2.5×12.5
=(4×2.5)×(12.5×0.8)
=10×10
=100
(4)×÷×
=(×)×(÷)
=×1
=
15.下面各题怎样简便就怎样算.
【解答】解:(1)+﹣
=﹣
=;
(2)﹣(+)
=﹣
=;
(3)+(﹣)
=+
=;
(4)﹣﹣
=﹣(+)
=﹣1
=;
(5)﹣+﹣
=(+)﹣(+)
=1﹣
=;
(6)+++
=(+)+(+)
=1+1
=2.
16.我会算(能简算的要简算):
×99+
24×(﹣+)
3.7×+2.3÷
19×
26÷÷
÷(+)
【解答】解:(1)×99+
=×(99+1)
=×100
=12;
(2)24×(﹣+)
=24×﹣24×+24×
=8﹣6+4
=2+4
=6;
(3)3.7×+2.3÷
=3.7×+2.3×
=(3.7+2.3)×
=6×
=5;
(4)19×
=
=;
(5)26÷÷
=26÷(×)
=26÷
=;
(6)÷(+)
=÷
=.
17.计算下列各题,(能简算的要简算)
【解答】解:(1)×+×
=×(+)
=×
=;
(2)+×
=+
=;
(3)(﹣÷2)×
=(﹣)×
=×
=;
(4)(+)×
=×+×
=+
=;
(5)(12.5×13)×0.8
=(12.5×0.8)×13
=10×13
=130;
(6)×+÷
=×+×
=×(+)
=×1
=.
18.用简便方法计算下面各题.
【解答】解:(1)×+÷
=×+×
=×(+)
=×1
=;
(2)1.25×7.8×0.8
=1.25×0.8×7.8
=1×7.8
=7.8;
(3)3.89﹣1.7﹣0.3
=3.89﹣(1.7+0.3)
=3.89﹣2
=1.89;
(4)102×5.6
=(100+2)×5.6
=100×5.6+2×5.6
=560+11.2
=571.2;
(5)63×(+﹣)
=63×+63×﹣63×
=35+12﹣27
=47﹣27
=20;
(6)1999×
=(1998+1)×
=1998×+1×
=1997+
=1997;
(7)﹣×
=×(1﹣)
=×
=;
(8)4500÷125÷8
=4500÷(125×8)
=4500÷1000
=4.5;
(9)4.25++3.75+
=(4.25+3.75)+(+)
=8+2
=10;
(10)23×+7×
=(23+7)×
=30×
=19;
(11)0.125×38+12.5%×41+
=0.125×38+0.125×41+0.125
=0.125×(38+41+1)
=0.125×80
=10;
(12)0.38×25+6.2×2.5
=3.8×2.5+6.2×2.5
=(3.8+6.2)×2.5
=10×2.5
=25;
(13)25×125×32
=25×125×(4×8)
=(25×4)×(125×8)
=100×1000
=100000.
19.下面各题,怎样算简便就怎样算:
÷(﹣)×
×(+)+
÷+×
[﹣(﹣)]÷.
【解答】解:(1)÷(﹣)×
=÷×
=××
=;
(2)×(+)+
=×+×+
=++
=+(+)
=+
=;
(3)÷+×
=×+×
=(+)×
=1×
=;
(4)[﹣(﹣)]÷
=[﹣]÷
=÷
=.
20.用脱式计算(能简算的要简算).
【解答】解:①35×(1﹣)÷
=
=48
②54.2﹣+4.8﹣
=(54.2+4.8)﹣(+)
=59﹣2
=57
③24﹣15.6÷2.5×1.5
=24﹣6.24×1.5
=24﹣9.36
=14.64
④+÷+
=
=
=1+5
=6
⑤5×+3×+
=(5+3+1)×
=9×
=1
⑥0.125×2.5×32
=(0.125×8)×(2.5×4)
=1×10
=10
21.怎样简便就怎样算
2﹣×﹣
2.5×9×1.25×4×8
×47+×47+47÷
1110÷[56×(﹣)].
【解答】解:(1)2﹣×﹣
=2﹣﹣
=2﹣(+)
=2﹣1
=1;
(2)2.5×9×1.25×4×8
=(2.5×4)×(1.25×8)×9
=10×10×9
=900;
(3)×47+×47+47÷
=×47+×47+2×47
=(++2)×47
=3×47
=141;
(4)1110÷[56×(﹣)]
=1110÷[24﹣21]
=1110÷3
=.
22.下面各题怎样算简便就怎样算.
①3.2﹣1.05×0.6
②4×125×8×25
③6.78×8.5+6.78×1.5
④(87﹣75)÷2×1.5
⑤÷[1﹣(+)].
【解答】解:①3.2﹣1.05×0.6
=3.2﹣0.63
=2.57
②4×125×8×25
=(4×25)×(8×125)
=100×1000
=100000
③6.78×8.5+6.78×1.5
=6.78×(8.5+1.5)
=6.78×10
=67.8
④(87﹣75)÷2×1.5
=12÷2×1.5
=6×1.5
=9
⑤÷[1﹣(+)]
=÷[1﹣]
=÷
=
23.下面各题怎样简便怎样算.
7×(+)×11
48×﹣35÷
4.54+9.99×999+5.45.
【解答】解:(1)7×(+)×11
=7×11×+×7×11
=44+70
=114;
(2)48×﹣35÷
=48×﹣35×
=(48﹣35)×
=13×
=9;
(3)4.54+9.99×999+5.45
=(4.54+5.45)+9.99×999
=9.99+9.99×999
=(1+999)×9.99
=1000×9.99
=9990.
24.计算下面各题,(能简算的要简算).
×(﹣)
÷+×6
12.05﹣2.56﹣5.44
﹣(﹣)×2.
【解答】解:
(1)×(﹣)
=×﹣×
=1﹣
=
(2)÷+×6
=×6+×6
=()×6
=1×6
=6
(3)12.05﹣2.56﹣5.44
=12.05﹣(2.56+5.44)
=12.05﹣8
=4.05
(4)﹣(﹣)×2
=﹣(﹣)×2
=﹣×2
=﹣
=
25.递等式计算(能简算的要简算).
0.125×0.25×32
×+÷
6.6×12+0.8×66
8.05﹣375%﹣
(﹣+)×
21.57﹣(2.57+3.38)﹣2.62.
【解答】解:(1)0.125×0.25×32
=0.125×0.25×4×8
=(0.125×8)×(0.25×4)
=1×1
=1;
(2)×+÷
=×+×
=×(+)
=×
=;
(3)6.6×12+0.8×66
=66×1.2+0.8×66
=66×(1.2+0.8)
=66×2
=132;
(4)8.05﹣375%﹣
=8.05﹣3.75﹣0.25
=8.05﹣(3.75+0.25)
=8.05﹣4
=4.05;
(5)(﹣+)×
=×
=;
(6)21.57﹣(2.57+3.38)﹣2.62
=21.57﹣2.57﹣3.38﹣2.62
=(21.57﹣2.57)﹣(3.38+2.62)
=19﹣6
=13.
26.计算下列各题,能简算的要简算.
﹣×﹣=
+×+=
÷2+2÷=
30×(+)=
÷+×=
×+×=
【解答】解:(1)﹣×﹣
=﹣﹣
=﹣(+)
=﹣1
=
(2)+×+
=+(+)
=+1
=1
(3)÷2+2÷
=×+2×
=+5
=5
(4)30×(+)
=30×+30×
=12+5
=17
(5)÷+×
=×+×
=( +)×
=
(6)×+×
=×(+)
=×2
=
27.计算,能简算的要简算.
【解答】解:(1)÷0.6×
=×
=;
(2)÷9+×
=×+×
=(+)×
=1×
=;
(3)2﹣÷﹣
=2﹣﹣
=2﹣(+)
=2﹣2
=0;
(4)87×
=(86+1)×
=86×+1×
=3+
=3;
(5)(﹣)×24﹣
=×24﹣×24﹣
=14﹣9﹣
=5﹣
=4;
(6)(+)÷﹣
=÷﹣
=﹣
=.
28.计算下面各题(能简算的要简算)
×﹣÷
÷[(+)×2]
×3.2+5.6×0.5+1.2×50%
【解答】解:(1)×﹣÷
=×﹣×
=(﹣)×
=2×
=
(2)÷[(+)×2]
=÷[×2+×2]
=÷[]
=÷
=×
=
(3)×3.2+5.6×0.5+1.2×50%
=0.5×3.2+5.6×0.5+1.2×0.5,
=0.5×(3.2+5.6+1.2),
=0.5×10,
=5
29.怎样简便就怎样算
【解答】解:(1)30×(+)
=30×+30×
=12+5
=17
(2)÷+×
=+
=
(3)5﹣(÷+)
=5﹣(4+)
=5﹣4
=
(4)+÷﹣
=+﹣
=﹣
=
(5)×[﹣(﹣)]
=×[﹣]
=×
=
(6)(+)×8×9
=×9×8+×8×9
=24+27
=51
30.计算(能简算的要简算).
×(÷)
(+)×24
(+)÷+
(+﹣)×54
××16
28×.
【解答】解:(1)×(÷)
=×
=;
(2)(+)×24
=×24+×24
=18+15
=33;
(3)(+)÷+
=÷+
=+
=;
(4)(+﹣)×54
=×54+×54﹣×54
=18+9﹣6
=27﹣6
=21;
(5)××16
=
=;
(6)28×
=(27+1)×
=27×+1×
=5+
=5.
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