中小学教育资源及组卷应用平台
第一单元小数乘除法混合运算(专项训练)-小学数学五年级上册北师大版
一、计算题
1.计算。
(1)37÷(2.63+4.77)
(2)(4.1+0.35)÷0.5
(3)0.49÷0.07×0.2
(4)1.6×0.4÷0.04
2.计算下面各题。
①5.88×0.6÷0.21
②20.6-9.03÷0.86
③63÷1.4÷3.6
④19.44÷2.7+40.8
⑤0.25×6.47×40
⑥(4.8+0.54)÷0.6
3.脱式计算,能简算的要简算。
①18.2+10×(0.96+1.04)
②6.21÷1.25÷0.8
③4.86×9.6+0.486×4
④1.3+2.9+8.7+13.31
⑤25×1.02
⑥21÷3.5+21÷1.5
4.计算下面各题(用你喜欢的方法计算,但必须写下计算的过程)。
(1)0.27×35÷0.21
(2)8÷2.5×4
(3)0.35×6.4-5.4×0.35
5.计算下面各题,能简算的要简算。
(1)9.6×101-9.6
(2)434÷0.25÷80
(3)(28.3-19.8)×5.4
(4)14.4÷3.2+2.5
6.计算下面各题,能简算的要简算
①12.5×4.8
②28.5÷15×5.6
③21÷0.25÷0.4
④0.55×5.6+0.45×5.6
⑤24.6×18-24.6×8.
⑥20.9+8.5÷(5.2-3.5)
7.脱式计算
(1)4.68÷(22-14.2)
(2)2.02÷0.8÷1.25
(3)0.85×7.2-8.5×0.52
8.脱式计算。
①0.87÷2.9×1.3
②4.62÷(5.4÷0.09)
③(2.77+1.33)÷0.25
④0.225÷0.25÷4
⑤4.5×2.4+5.5×2.4
⑥3.15×101-3.15
9.脱式计算。
(1)58.8÷2.8÷0.7
(2)4.5×0.56÷1.4
(3)(5.3-1.7)÷0.09
10.脱式计算。
①8.54÷2.8×5.6
②11.7÷(3.8-1.2)
③4.2÷0.75÷0.5
④1.8-0.8÷0.5
⑤2.4÷2.5×4
⑥4.2÷(0.75÷0.5)
11.能简算的要简算。
(1)0.4×370×2.5
(2)1.8×[0.17÷(3.08+5.42)]
(3)8.4+1.6×4.5
(4)28×0.36+1.4×2.8
12.列竖式计算。(带※的得数保留两位小数)
①0.285÷0.38
②0.023×1.8
③※16.787÷0.28
④0.48×3.6
⑤1.05÷2.8
⑥※5.6×1.08
13.计算下面各题,能简便计算的简算。
(1)12.5×24×0.8
(2)7.8×99+7.8
(3)8.54÷2.5÷0.4
(4)9.8×22
14.仔细算一算。
(1)7.8÷1.2+4.9÷0.14
(2)9.24÷1.4÷0.25
(3)18.8÷[0.2×(7.6-2.9)]
15.脱式计算,能简算的要简算。
(1)2.5×201
(2)63.8×8.5+8.5×36.2
(3)25×12.5×0.4×0.08
(4)20.4÷[0.8×(7.5-6.25)]
16.计算下面各题。(能简算的要简算)
①1.25×3.2
②9÷〔(38.02+1.98)×0.3〕
③9.4×10.1
④0.85×9.8
⑤17÷(3.84+2.96)-0.2
⑥37.2×0.35+6.28×3.5
17.脱式计算。
(1)(5.6-2.8)÷1.4
(2)78÷0.25÷4
(3)0.36÷0.3×4
(4)5.4×(4.32÷1.2)
18.能简算的要简算。
①2.5×7.1×4
②16.12×99+16.12
③26×15.7+15.7×24
④8.4÷5+1.6÷5
⑤1.25×0.32×2.5
⑥17.5+2.5×4
19.脱式计算,能简算的要简算。
①37.2×99+37.2
②0.125×3.2×0.25
③5.83×2+4.27
④17.68÷5.2+2.7×1.5
⑤6.33×101
⑥(45.9-32.7)÷8÷0.125
20.递等式计算,能简算的要简算。
(1)4.57×16.8-6.8×4.57
(2)6.3÷1.8×0.8
(3)12.6-12.6÷1.2
(4)8.8×12.5
答案解析部分
1.【答案】(1)解:先算加法,再算除法
37÷(2.63+4.77)
=37÷7.4
=0.5
(2)解:先算加法,再算除法
(4.1+0.35)÷0.5
=4.45÷0.5
=8.9
(3)按照从左到右的顺序计算
0.49÷0.07×0.2
=7×0.2
=1.4
(4)解:按照从左到右的顺序计算
1.6×0.4÷0.04
=0.64÷0.04
=16
2.【答案】解:①5.88×0.6÷0.21
=3.528÷0.21
=16.8
②20.6-9.03÷0.86
=20.6-10.5
=10.1
③63÷1.4÷3.6
=45÷3.6
=12.5
④19.44÷2.7+40.8
=7.2+40.8
=48
⑤0.25×6.47×40
=0.25×40×6.47
=10×6.47
=64.7
⑥(4.8+0.54)÷0.6
=5.34÷0.6
=8.9
3.【答案】①18.2+10×(0.96+1.04)
=18.2+10×2
=18.2+20
=38.2
②6.21÷1.25÷0.8
=6.21÷(1.25×0.8)
=6.21÷1
=6.21
③4.86×9.6+0.486×4
=4.86×9.6+4.86×0.4
=4.86×(9.6+0.4)
=4.86×10
=48.6
④1.3+2.9+8.7+13.31
=(1.3+8.7)+(2.9+13.31)
=10+16.21
=26.21
⑤25×1.02
=25×(1+0.02)
=25×1+25×0.02
=25+0.5
=25.5
⑥21÷3.5+21÷1.5
=6+14
=20
4.【答案】(1)0.27×35÷0.21
=9.45÷0.21
=45
(2)8÷2.5×4
=3.2×4
=12.8
(3)0.35×6.4-5.4×0.35
=0.35×(6.4-5.4)
=0.35×1
=0.35
5.【答案】(1)解:=9.6×(101-1)
=9.6×100
=960
(2)解:=434÷(0.25×80)
=434÷20
=21.7
(3)解:=8.5×5.4
=45.9
(4)解:=4.5+2.5
=7
6.【答案】解:①12.5×4.8
=12.5×0.8×6
=10×6
=60
②28.5÷15×5.6
=1.9×5.6
=10.64
③21÷0.25÷0.4
=21÷(0.25×0.4)
=21÷0.1
=210
④0.55×5.6+0.45×5.6
=(0.55+0.45)×5.6
=1×5.6
=5.6
⑤24.6×18-24.6×8
=24.6×(18-8)
=24.6×10
=246
⑥20.9+8.5÷(5.2-3.5)
=20.9+8.5÷1.7
=20.9+5
=25.9
7.【答案】(1)4.68÷(22-14.2)
=4.68÷7.8
=0.6
(2)2.02÷0.8÷1.25
=2.02÷(0.8×1.25)
=2.02÷1
=2.02
(3)0.85×7.2-8.5×0.52
=0.85×7.2-0.85×5.2
=0.85×(7.2-5.2)
=0.85×2
=1.7
8.【答案】①0.87÷2.9×1.3
=0.3×1.3
=0.39
②4.62÷(5.4÷0.09)
=4.62÷60
=0.077
③(2.77+1.33)÷0.25
=4.1÷0.25
=16.4
④0.225÷0.25÷4
=0.225÷(0.25×4)
=0.225÷1
=0.225
⑤4.5×2.4+5.5×2.4
=(4.5+5.5)×2.4
=10×2.4
=24
⑥3.15×101-3.15
=3.15×101-3.15×1
=3.15×(101-1)
=3.15×100
=315
9.【答案】(1)58.8÷2.8÷0.7
=21÷0.7
=30
(2)4.5×0.56÷1.4
=2.52÷1.4
=1.8
(3)(5.3-1.7)÷0.09
=3.6÷0.09
=40
10.【答案】①8.54÷2.8×5.6
=3.05×5.6
=17.08
②11.7÷(3.8-1.2)
=11.7÷2.6
=4.5
③4.2÷0.75÷0.5
=5.6÷0.5
=11.2
④1.8-0.8÷0.5
=1.8-1.6
=0.2
⑤2.4÷2.5×4
=0.96×4
=3.84
⑥4.2÷(0.75÷0.5)
=4.2÷1.5
=2.8
11.【答案】(1)0.4×370×2.5
=(0.4×2.5)×370
=1×370
=370
(2)1.8×[0.17÷(3.08+5.42)]
=1.8×[0.17÷8.5]
=1.8×0.02
=0.036
(3)8.4+1.6×4.5
=8.4+7.2
=15.6
(4)28×0.36+1.4×2.8
=2.8×(3.6+1.4)
=2.8×5
=14
12.【答案】①0.285÷0.38=0.75
②0.023×1.8=0.0414
③16.787÷0.28≈59.95
④0.48×3.6=1.728
⑤1.05÷2.8=0.375
⑥5.6×1.08≈6.05
13.【答案】(1)12.5×24×0.8
=(12.5×0.8)×24
=10×24
=240
(2)7.8×99+7.8
=7.8×(99+1)
=7.8×100
=780
(3)8.54÷2.5÷0.4
=8.54÷(2.5×0.4)
=8.54×1
=8.54
(4)9.8×22
=(10-0.2)×22
=10×22-0.2×22
=22-0.44
=21.56
14.【答案】(1)解:7.8÷1.2+4.9÷0.14
=6.5+35
=41.5
(2)解:9.24÷1.4÷0.25
=6.6÷0.25
=26.4
(3)解:18.8÷[0.2×(7.6-2.9)]
=18.8÷[0.2×4.7]
=18.8÷0.94
=20
15.【答案】(1)2.5×201
=2.5×(200+1)
=2.5×200+2.5×1
=500+2.5
=502.5
(2)63.8×8.5+8.5×36.2
=(63.8+36.2)×8.5
=100×8.5
=850
(3)25×12.5×0.4×0.08
=(25×0.4)×(12.5×0.08)
=10×1
=10
(4)20.4÷[0.8×(7.5-6.25)]
=20.4÷[0.8×1.25]
=20.4÷1
=20.4
16.【答案】①1.25×3.2
=1.25×8×0.4
=10×0.4
=4;
②9÷〔(38.02+1.98)×0.3〕
=9÷[40×0.3]
=9÷12
=0.75;
③9.4×10.1
=9.4×(10+0.1)
=9.4×10+9.4×0.1
=94+0.94
=94.94;
④0.85×9.8
=0.85×(10-0.2)
=0.85×10-0.85×0.2
=8.5-0.17
=8.33;
⑤17÷(3.84+2.96)-0.2
=17÷6.8-0.2
=2.5-0.2
=2.3;
⑥37.2×0.35+6.28×3.5
=3.72×3.5+6.28×3.5
=(3.72+6.28)×3.5
=10×3.5
=35。
17.【答案】(1)(5.6-2.8)÷1.4
=2.8÷1.4
=2
(2)78÷0.25÷4
=78÷(0.25×4)
=78÷1
=78
(3)0.36÷0.3×4
=1.2×4
=4.8
(4)5.4×(4.32÷1.2)
=5.4×3.6
=19.44
18.【答案】①2.5×7.1×4
=(2.5×4)×7.1
=1×7.1
=7.1
②16.12×99+16.12
=16.12×(99+1)
=16.12×100
=1612
③26×15.7+15.7×24
=15.7×(26+24)
=15.7×50
=785
④8.4÷5+1.6÷5
=(8.4+1.6)÷5
=10÷5
=2
⑤1.25×0.32×2.5
=(1.25×0.8)×(0.4×2.5)
=1×1
=1
⑥17.5+2.5×4
=17.5+10
=27.5
19.【答案】①37.2×99+37.2
=37.2×(99+1)
=37.2×100
=3720
②0.125×3.2×0.25
=0.125×8×0.4×0.25
=1×0.1
=0.1
③5.83×2+4.27
=11.66+4.27
=15.93
④17.68÷5.2+2.7×1.5
=3.4+4.05
=7.45
⑤6.33×101
=6.33×(100+1)
=6.33×100+6.33
=633+6.33
=639.33
⑥(45.9-32.7)÷8÷0.125
=(45.9-32.7)÷(8×0.125)
=13.2÷1
=13.2
20.【答案】(1)4.57×16.8-6.8×4.57
=4.57×(16.8-6.8)
=4.57×10
=45.7
(2)6.3÷1.8×0.8
=3.5×0.8
=2.8
(3)12.6-12.6÷1.2
=12.6-10.5
=2.1
(4)8.8×12.5
=1.1×(8×12.5)
=1.1×100
=110