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一、直接写出得数。(每题1分,共32分)
9.6-0.4=
1.9+0.8=
2.01+0.9=
2.9+0.3+1.6=
0.7+2.3=
2.6-1.7=
0.9÷4.5=
0.1-0.01+2.8=
4.2×0.4=
3.2÷1.6=
3.2×0.02=
0.39÷0.13×6=
2.3÷0.1=
1.44÷1.2=
1.8÷4=
2.3×0.1÷10=
4.3×0.1=
2.4×0.3=
7÷0.14=
2.8÷0.125÷0.8=
1.42÷0.2=
8.4÷0.07=
0.125×6=
0.8×0.2×0.1=
9×0.08=
5÷0.2=
0.28×0.5=
9.7-10.5÷5=
21.3÷0.3=
2.4×30=
6.25÷2.5=
5.6÷0.4-1.8=
9.6-0.4=
9.2
1.9+0.8=
2.7
2.01+0.9=
2.91
2.9+0.3+1.6=
4.8
0.7+2.3=
3
2.6-1.7=
0.9
0.9÷4.5=
0.2
0.1-0.01+2.8=
2.89
4.2×0.4=
1.68
3.2÷1.6=
2
3.2×0.02=
0.064
0.39÷0.13×6=
18
2.3÷0.1=
23
1.44÷1.2=
1.2
1.8÷4=
0.45
2.3×0.1÷10=
0.023
4.3×0.1=
0.43
2.4×0.3=
0.72
7÷0.14=
50
2.8÷0.125÷0.8=
28
1.42÷0.2=
7.1
8.4÷0.07=
120
0.125×6=
0.75
0.8×0.2×0.1=
0.016
9×0.08=
0.72
5÷0.2=
25
0.28×0.5=
0.14
9.7-10.5÷5=
7.6
21.3÷0.3=
71
2.4×30=
72
6.25÷2.5=
2.5
5.6÷0.4-1.8=
12.2
答案
9.2 2.7 2.91 4.8 3 0.9 0.2 2.89 1.68 2 0.064 18 23 1.2 0.45 0.023 0.43 0.72 50 28 7.1 120 0.75 0.016 0.72 25 0.14 7.6 71 72 2.5 12.2
二、用竖式计算,带☆的要验算。(每题3分,验算各1分,共20分)
13.6×6.7=
0.58×0.605=
☆3.78÷1.5=
15.36÷1.2=
☆3.68×2.6=
128.8÷0.23=
竖式及验算略
13.6×6.7=
91.12
0.58×0.605=
0.3509
☆3.78÷1.5=
2.52
15.36÷1.2=
12.8
☆3.68×2.6=
9.568
128.8÷0.23=
560
竖式及验算略
答案
91.12 0.3509 2.52 12.8 9.568 560
竖式及验算略
竖式及验算略
三、计算下面各题,能简算的要简算。(每题3分,共18分)
4.5×19.9
3.76×0.25-0.49
(2.44-1.8)÷0.4×20
2.5×56+4.5×56
200-(3.05+7.1)×18
30.8÷[14-(9.85+1.07)]
4.5×19.9
3.76×0.25-0.49
(2.44-1.8)÷0.4×20
2.5×56+4.5×56
200-(3.05+7.1)×18
30.8÷[14-(9.85+1.07)]
答案
89.55 0.45 32 392 17.3 10
解析
4.5×19.9
=4.5×(20-0.1)
=4.5×20-4.5×0.1
=90-0.45
=89.55
3.76×0.25-0.49
=0.94-0.49
=0.45
(2.44-1.8)÷0.4×20
=0.64÷0.4×20
=1.6×20
=32
2.5×56+4.5×56
=(2.5+4.5)×56
=7×56
=392
200-(3.05+7.1)×18
=200-10.15×18
=200-182.7
=17.3
30.8÷[14-(9.85+1.07)]
=30.8÷[14-10.92]
=30.8÷3.08
=10
=4.5×(20-0.1)
=4.5×20-4.5×0.1
=90-0.45
=89.55
3.76×0.25-0.49
=0.94-0.49
=0.45
(2.44-1.8)÷0.4×20
=0.64÷0.4×20
=1.6×20
=32
2.5×56+4.5×56
=(2.5+4.5)×56
=7×56
=392
200-(3.05+7.1)×18
=200-10.15×18
=200-182.7
=17.3
30.8÷[14-(9.85+1.07)]
=30.8÷[14-10.92]
=30.8÷3.08
=10
