Question

10．直接寫出得數(shù)．

0.2×0.5=	12.1÷11=	2.5×0.4=	12.5×0.8=	1.3÷0.25÷0.4=
0.4+0.7=	9.2-3.75=	0.18+0.37=	0.35×0.2=	9.57-1.9-7.57=
2.4×0.9=	3.5×0.4=	4.19+1.81=	0.46÷0.23=	12.5×1.9×0.8=

Answer 1

分析 根據(jù)小數(shù)加減乘除法運(yùn)算的計(jì)算法則計(jì)算即可求解．注意1.3÷0.25÷0.4根據(jù)除法的性質(zhì)計(jì)算，9.57-1.9-7.57變形為9.57-7.57-1.9計(jì)算，12.5×1.9×0.8根據(jù)乘法分配律和結(jié)合律計(jì)算．

解答 解：

0.2×0.5=0.1	12.1÷11=1.1	2.5×0.4=1	12.5×0.8=10	1.3÷0.25÷0.4=13
0.4+0.7=1.1	9.2-3.75=5.45	0.18+0.37=0.55	0.35×0.2=0.07	9.57-1.9-7.57=0.1
2.4×0.9=2.16	3.5×0.4=1.4	4.19+1.81=6	0.46÷0.23=2	12.5×1.9×0.8=19

點(diǎn)評 考查了小數(shù)加減乘除法運(yùn)算，關(guān)鍵是熟練掌握計(jì)算法則正確進(jìn)行計(jì)算．