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第85页

信息发布者：

2625

0.91

3.15

0.5

$\frac {7}{6}$

$\frac {13}{15}$

$6\frac {3}{5}$

$\frac {4}{3}$

2970000500

3000000000

8.05

0.15

125

0.4

$\frac {2}{5}$

$ =\frac {5}{12}×\frac {1}{13}－\frac {1}{4}×\frac {1}{13}$

$ =\frac {1}{13}×(\frac {5}{12}－\frac {1}{4})$

$ =\frac {1}{13}×\frac {1}{6}$

$ =\frac {1}{78}$

$ =(3.35×2)×99+6.7×1$

$ =6.7×99+6.7×1$

$ =6.7×(99+1)$

$ =670$

$=36÷(\frac {1}{2}×3)$

$=36÷\frac {3}{2}$

$=36×\frac {2}{3}$

$=24$

$\begin{aligned}解：0.25x&=1.25×0.8×2\\0.25x&=2\\x&=2÷0.25\\x&=8\end{aligned}$

$\begin{aligned}解：2x&=\frac {4}{9}\\x&=\frac {4}{9}÷2\\x&=\frac {2}{9}\end{aligned}$

$\begin{aligned}解：3.2x&=52+12\\3.2x&=64\\x&=64÷3.2\\x&=20\end{aligned}$