Question

5．直接寫得數(shù)

452+98=	1.25×8=	640÷16=	$\frac{1}{5}$×$\frac{1}{2}$÷$\frac{1}{5}$×$\frac{1}{2}$=
1÷0.125-8=	5.01-1.8=	0.25×0.4=	0.88+0.12=
6.5+9.5+3.5=	$\frac{5}{6}$×$\frac{8}{15}$=

Answer 1

分析 根據(jù)整數(shù)、小數(shù)和分?jǐn)?shù)加減乘除法運(yùn)算的計(jì)算法則計(jì)算即可求解．注意$\frac{1}{5}$×$\frac{1}{2}$÷$\frac{1}{5}$×$\frac{1}{2}$變形為（$\frac{1}{5}$÷$\frac{1}{5}$）×（$\frac{1}{2}$×$\frac{1}{2}$）計(jì)算，6.5+9.5+3.5根據(jù)加法交換律和結(jié)合律計(jì)算．

解答 解：

452+98=550	1.25×8=10	640÷16=40	$\frac{1}{5}$×$\frac{1}{2}$÷$\frac{1}{5}$×$\frac{1}{2}$=$\frac{1}{4}$
1÷0.125-8=0	5.01-1.8=3.21	0.25×0.4=0.1	0.88+0.12=1
6.5+9.5+3.5=19.5	$\frac{5}{6}$×$\frac{8}{15}$=$\frac{4}{9}$

點(diǎn)評 考查了整數(shù)、小數(shù)和分?jǐn)?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．