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1. 直接写出得数。
1.2×2=
0.3×0.5=
0.7×0.2=
1.8×0.4×100=
1.2×0.2=
3.1×0.3=
8.5×0.3=
1.6×0.6×10=
1.7×5=
1.2×0.6=
1.5×0.5=
4.4×0.2×2=
1.7×0.5=
4.3×0.1=
10.2×0.4=
1.1×0.7×100=
1.8×4=
1.2×0.3=
0.5×5.6=
0.6×0.4×2=
1.8×0.4=
2.1×0.7=
1.3×0.8=
2.4×0.5×2=
2.1×5=
0.5×1.3=
2.2×0.4=
0.25×0.4×1000=
2.1×0.5=
1.6×0.8=
0.5×1.4=
0.12×0.1×10=
1.2×2=
2.4
0.3×0.5=
0.15
0.7×0.2=
0.14
1.8×0.4×100=
72
1.2×0.2=
0.24
3.1×0.3=
0.93
8.5×0.3=
2.55
1.6×0.6×10=
9.6
1.7×5=
8.5
1.2×0.6=
0.72
1.5×0.5=
0.75
4.4×0.2×2=
1.76
1.7×0.5=
0.85
4.3×0.1=
0.43
10.2×0.4=
4.08
1.1×0.7×100=
77
1.8×4=
7.2
1.2×0.3=
0.36
0.5×5.6=
2.8
0.6×0.4×2=
0.48
1.8×0.4=
0.72
2.1×0.7=
1.47
1.3×0.8=
1.04
2.4×0.5×2=
2.4
2.1×5=
10.5
0.5×1.3=
0.65
2.2×0.4=
0.88
0.25×0.4×1000=
100
2.1×0.5=
1.05
1.6×0.8=
1.28
0.5×1.4=
0.7
0.12×0.1×10=
0.12
答案
2.4 0.15 0.14 72 0.24 0.93 2.55 9.6 8.5 0.72 0.75 1.76 0.85 0.43 4.08 77 7.2 0.36 2.8 0.48 0.72 1.47 1.04 2.4 10.5 0.65 0.88 100 1.05 1.28 0.7 0.12
2. 用竖式计算。
5.8×1.9=
2.4×7.8=
0.36×1.5=
4.08×1.2=
6.62×5.5=
90.2×6.7=
竖式略
5.8×1.9=
11.02
2.4×7.8=
18.72
0.36×1.5=
0.54
4.08×1.2=
4.896
6.62×5.5=
36.41
90.2×6.7=
604.34
竖式略
答案
11.02 18.72 0.54 4.896 36.41 604.34 竖式略
解析
5.8×1.9=11.02
2.4×7.8=18.72
0.36×1.5=0.54
4.08×1.2=4.896
6.62×5.5=36.41
90.2×6.7=604.34
2.4×7.8=18.72
0.36×1.5=0.54
4.08×1.2=4.896
6.62×5.5=36.41
90.2×6.7=604.34
(1)要使积最大：
(2)要使积最小：
5
.2
×4
.3
(2)要使积最小：
3
.5
×2
.4
答案
(1)5.2×4.3
(2)3.5×2.4
