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第7頁

信息發(fā)布者：
$\frac{2}{5}$
16
$\frac{9}{16}$
$\frac{1}{17}$
$\frac{5}{9}$
$\frac{3}{4}$
$\frac{1}{8}$
0
解：$30\%x = 126$
$x = 126\div0.3$
$x = 420$
解：$\frac{2}{15}x+\frac{1}{6}x=\frac{2}{5}$
通分：$\frac{4}{30}x+\frac{5}{30}x=\frac{2}{5}$
$\frac{9}{30}x=\frac{2}{5}$
$x=\frac{2}{5}\times\frac{30}{9}$
$x=\frac{4}{3}$
解：$\frac{1}{3}x-\frac{1}{5}x=\frac{1}{10}$
通分：$\frac{5}{15}x-\frac{3}{15}x=\frac{1}{10}$
$\frac{2}{15}x=\frac{1}{10}$
$x=\frac{1}{10}\times\frac{15}{2}$
$x=\frac{3}{4}$
$\frac{21}{5}\div7\div\frac{9}{5}$
$=\frac{21}{5}\times\frac{1}{7}\times\frac{5}{9}$
$=\frac{3}{5}\times\frac{5}{9}$
$=\frac{1}{3}$
$30\times(\frac{2}{3}-\frac{2}{5})$
$=30\times\frac{2}{3}-30\times\frac{2}{5}$
$=20 - 12$
$=8$
$(\frac{1}{2}+\frac{7}{10})\times\frac{2}{5}+2$
$=(\frac{5}{10}+\frac{7}{10})\times\frac{2}{5}+2$
$=\frac{12}{10}\times\frac{2}{5}+2$
$=\frac{24}{50}+2$
$=\frac{12}{25}+2$
$=2\frac{12}{25}$
$\frac{5}{3}-\frac{4}{9}-\frac{5}{9}$
$=\frac{5}{3}-(\frac{4}{9}+\frac{5}{9})$
$=\frac{5}{3}-1$
$=\frac{2}{3}$
$\frac{6}{13}\times\frac{4}{5}+\frac{7}{13}\div\frac{5}{4}$
$=\frac{6}{13}\times\frac{4}{5}+\frac{7}{13}\times\frac{4}{5}$
$=(\frac{6}{13}+\frac{7}{13})\times\frac{4}{5}$
$=1\times\frac{4}{5}$
$=\frac{4}{5}$
$\frac{8}{49}\div[\frac{9}{8}-(\frac{1}{8}+\frac{3}{7})]$
$=\frac{8}{49}\div[\frac{9}{8}-\frac{1}{8}-\frac{3}{7}]$
$=\frac{8}{49}\div[1 - \frac{3}{7}]$
$=\frac{8}{49}\div\frac{4}{7}$
$=\frac{8}{49}\times\frac{7}{4}$
$=\frac{2}{7}$
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