Question

9．口算．

$\frac{1}{4}$×$\frac{8}{3}$=	$\frac{3}{10}$÷$\frac{30}{100}$=	0.6÷10%=	8%×0.8=	$\frac{6}{8}$×4=
$\frac{7}{13}$×$\frac{1}{7}$=	0.8-25%=	$\frac{4}{7}$÷$\frac{7}{4}$=	$\frac{1}{5}$×99+$\frac{1}{5}$=	$\frac{3}{4}$×$\frac{7}{6}$×10=

Answer 1

分析 根據(jù)分?jǐn)?shù)加減乘除法的計(jì)算方法計(jì)算．

解答 解：
$\frac{1}{4}×\frac{8}{3}=\frac{2}{3}$           $\frac{3}{10}$÷$\frac{30}{100}$=1     0.6÷10%=6       8%×0.8=0.064     $\frac{6}{8}$×4=3 
$\frac{7}{13}$×$\frac{1}{7}$=$\frac{1}{13}$          0.8-25%=0.55    $\frac{4}{7}$÷$\frac{7}{4}$=$\frac{16}{49}$        $\frac{1}{5}$×99+$\frac{1}{5}$=20      $\frac{3}{4}$×$\frac{7}{6}$×10=$\frac{35}{4}$

點(diǎn)評(píng) 口算題要正確計(jì)算的方法，計(jì)算時(shí)要看準(zhǔn)數(shù)和運(yùn)算符號(hào)．