Question

12．直接寫得數(shù)．

56÷100=	1.29-0.29=	0.56×100=	5.35+2.5=
0.625×100=	5-2.1=	359+402=	18.6-7=
8.07×10=	3.5+0.9=	1.2+0.08=	4×（25×14）=
7.34×0=	3.31+1.2=	25×4÷25×4=	0.25+0.2+0.75=

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4×（25×14）根據(jù)乘法結(jié)合律計(jì)算，25×4÷25×4變形為（25÷25）×（4×4）計(jì)算，0.25+0.2+0.75根據(jù)加法交換律和結(jié)合律計(jì)算．

解答 解：

56÷100=0.56	1.29-0.29=1	0.56×100=56	5.35+2.5=7.85
0.625×100=62.5	5-2.1=2.9	359+402=761	18.6-7=11.6
8.07×10=80.7	3.5+0.9=4.4	1.2+0.08=1.28	4×（25×14）=1400
7.34×0=0	3.31+1.2=4.51	25×4÷25×4=16	0.25+0.2+0.75=1.2

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．