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第67页

信息发布者：

2100

7.52

1.3

266

380

$\frac{7}{12}$

$1\frac{2}{3}$

$13\frac{1}{3}$

100

=450-103

=347

=5.8+4.4

=10.2

=25×0.4×8×125

=10×1000

=10000

$=\frac {1}{12}×(\frac {25}{49}+\frac {23}{49})$

$=\frac {1}{12}×\frac {48}{49}$

$=\frac {4}{49}$

=7+12

=19

$=\frac {3}{4}÷(\frac {21}{20}×\frac {3}{7})$

$=\frac {3}{4}÷\frac {9}{20}$

$=\frac {5}{3}$

$\begin{aligned}解：4x&=\frac {7}{15}×\frac {5}{7}\\4x&=\frac {1}{3}\\x&=\frac {1}{12}\end{aligned}$

$\begin{aligned}解：0.5x&=5.2-3.5\\0.5x&=1.7\\x&=3.4\end{aligned}$

$\begin{aligned}解：\frac {2}{3}x-\frac {1}{4}x&=\frac {5}{8}\\\frac {5}{12}x&=\frac {5}{8}\\x&=\frac {3}{2}\end{aligned}$