Question

5．直接寫得數(shù)

$\frac{1}{2}$+$\frac{1}{3}$=	$\frac{1}{5}$×$\frac{5}{2}$=	81÷$\frac{7}{9}$=	3.52+6.48=
0.25×40=	$\frac{3}{4}$-75%=	0÷$\frac{3}{5}$=	$\frac{5}{9}$×2÷$\frac{5}{9}$×2=

Answer 1

分析 根據(jù)分?jǐn)?shù)和小數(shù)加減乘除法的計(jì)算方法進(jìn)行計(jì)算．

解答 解：

$\frac{1}{2}$+$\frac{1}{3}$=$\frac{5}{6}$	$\frac{1}{5}$×$\frac{5}{2}$=$\frac{1}{2}$	81÷$\frac{7}{9}$=$\frac{729}{7}$	3.52+6.48=10
0.25×40=10	$\frac{3}{4}$-75%=0	0÷$\frac{3}{5}$=0	$\frac{5}{9}$×2÷$\frac{5}{9}$×2=4

點(diǎn)評(píng) 口算時(shí)，注意運(yùn)算符號(hào)和數(shù)據(jù)，然后再進(jìn)一步計(jì)算．