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1. 直接写出得数。(每题0.5分,共4分)
6.4÷0.16=
2.4×5=
1÷0.25=
0.37+0.3=
4.5÷100=
0.05×40=
5.7÷0.57=
6.8-1.4-2.6=
6.4÷0.16=
40
2.4×5=
12
1÷0.25=
4
0.37+0.3=
0.67
4.5÷100=
0.045
0.05×40=
2
5.7÷0.57=
10
6.8-1.4-2.6=
2.8
答案
40 12 4 0.67 0.045 2 10 2.8
2. 用竖式计算,带※的要验算。(带※的每题3分,其余每题2分,共9分)
4.8×0.35=
※0.756÷0.18=
0.016×0.65≈
(得数保留两位小数)
3.9÷1.58≈
(得数精确到百分位)
4.8×0.35=
1.68
※0.756÷0.18=
4.2
0.016×0.65≈
0.01
(得数保留两位小数)
3.9÷1.58≈
2.47
(得数精确到百分位)
答案
1.68 4.2 0.01 2.47
3. 计算下面各题,能简算的要简算。(每题3分,共12分)
1.25×3.2×2.5
76.8÷[(2.8+2.3)÷0.17]
0.78×10.1
(14.5-18.6÷3.1)×16
1.25×3.2×2.5
76.8÷[(2.8+2.3)÷0.17]
0.78×10.1
(14.5-18.6÷3.1)×16
答案
10 2.56 7.878 136
解析
1.25×3.2×2.5
=1.25×(0.8×4)×2.5
=(1.25×0.8)×(4×2.5)
=1×10
=10
76.8÷[(2.8+2.3)÷0.17]
=76.8÷[5.1÷0.17]
=76.8÷30
=2.56
0.78×10.1
=0.78×(10+0.1)
=0.78×10+0.78×0.1
=7.8+0.078
=7.878
(14.5-18.6÷3.1)×16
=(14.5-6)×16
=8.5×16
=136
=1.25×(0.8×4)×2.5
=(1.25×0.8)×(4×2.5)
=1×10
=10
76.8÷[(2.8+2.3)÷0.17]
=76.8÷[5.1÷0.17]
=76.8÷30
=2.56
0.78×10.1
=0.78×(10+0.1)
=0.78×10+0.78×0.1
=7.8+0.078
=7.878
(14.5-18.6÷3.1)×16
=(14.5-6)×16
=8.5×16
=136
