Question

1．直接寫得數(shù)

$\frac{4}{7}$÷$\frac{7}{4}$=	$\frac{1}{3}$×3=	6×$\frac{1}{12}$=	$\frac{1}{7}$+$\frac{6}{7}$×$\frac{1}{7}$=
0.6×$\frac{2}{3}$=	0.32=	$\frac{1}{5}$×3÷3×$\frac{1}{5}$=	$\frac{2}{3}$×1.25×0.8=

Answer 1

分析 根據(jù)分?jǐn)?shù)乘法、分?jǐn)?shù)除法的計(jì)算法則，依次進(jìn)行計(jì)算，含有兩級(jí)運(yùn)算的，應(yīng)根據(jù)四則混合運(yùn)算的運(yùn)算順序進(jìn)行計(jì)算，注意$\frac{2}{3}$×1.25×0.8，可以運(yùn)用乘法結(jié)合律進(jìn)行簡(jiǎn)算．

解答 解：

$\frac{4}{7}$÷$\frac{7}{4}$=$\frac{16}{49}$	$\frac{1}{3}$×3=1	6×$\frac{1}{12}$=$\frac{1}{2}$	$\frac{1}{7}$+$\frac{6}{7}$×$\frac{1}{7}$=$\frac{13}{49}$
0.6×$\frac{2}{3}$=$\frac{2}{5}$	0.32=0.09	$\frac{1}{5}$×3÷3×$\frac{1}{5}$=$\frac{1}{25}$	$\frac{2}{3}$×1.25×0.8=$\frac{2}{3}$

點(diǎn)評(píng) 明確分?jǐn)?shù)乘法、分?jǐn)?shù)除法的計(jì)算法則，是解答此題的關(guān)鍵．