Question

5．口算．

$\frac{11}{15}$×$\frac{25}{44}$	$\frac{25}{39}$×$\frac{13}{50}$	$\frac{10}{9}$×6×0	180÷$\frac{9}{10}$
$\frac{7}{11}$÷14	0.8÷$\frac{16}{13}$	$\frac{9}{10}$×$\frac{2}{3}$×$\frac{5}{6}$	$\frac{5}{8}$÷$\frac{2}{3}$×$\frac{3}{2}$

Answer 1

分析 依據(jù)四則混合運(yùn)算順序，根據(jù)分?jǐn)?shù)乘法、分?jǐn)?shù)除法計(jì)算法則進(jìn)行口算，結(jié)果要約成最簡分?jǐn)?shù)．

解答 解：

$\frac{11}{15}$×$\frac{25}{44}$=$\frac{5}{12}$	$\frac{25}{39}$×$\frac{13}{50}$=$\frac{1}{6}$	$\frac{10}{9}$×6×0=0	180÷$\frac{9}{10}$=200
$\frac{7}{11}$÷14=$\frac{1}{22}$	0.8÷$\frac{16}{13}$=$\frac{13}{20}$	$\frac{9}{10}$×$\frac{2}{3}$×$\frac{5}{6}$=$\frac{1}{2}$	$\frac{5}{8}$÷$\frac{2}{3}$×$\frac{3}{2}$=$1\frac{13}{32}$

點(diǎn)評(píng) 此題考查了分?jǐn)?shù)乘法、分?jǐn)?shù)除法計(jì)算法則以及四則混合運(yùn)算順序的應(yīng)用情況．