Question

20．計算

0.2×0.4=	8.2+1.8=	100-35.22=	2.5×0.4=
0.8×50=	2.4×5=	0.9-0.52=	3.99×1=
0×3.52=	12.5×8=	1.25×0.4×8=	0.9×50=
3.6×0.1=	2.5×0.8=	0.8×0.6=	0.05×0.08=

Answer 1

分析 根據(jù)小數(shù)加減乘法運算的計算法則計算即可求解．注意1.25×0.4×8變形為1.25×8×0.4計算．

解答 解：

0.2×0.4=0.08	8.2+1.8=10	100-35.22=64.78	2.5×0.4=1
0.8×50=40	2.4×5=12	0.9-0.52=0.38	3.99×1=3.99
0×3.52=0	12.5×8=100	1.25×0.4×8=4	0.9×50=45
3.6×0.1=0.36	2.5×0.8=2	0.8×0.6=0.48	0.05×0.08=0.004

點評 考查了根據(jù)小數(shù)加減乘法運算，關(guān)鍵是熟練掌握計算法則正確進行計算．