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第81页

信息发布者：

520

1001

2.05

2000

0.75

$\frac {1}{5}$

$\begin{aligned}解：3x&=21.6\\x&=21.6÷3\\x&=7.2\end{aligned}$

860005000

86000.5

8.60005

六

$ \frac {1}{4}$

$\frac {3}{4}$

1:5000000

250

150

钝

$\begin{aligned}解：x&=0.75×4\\x&=3\end{aligned}$

$\begin{aligned}解：0.25x&=\frac {1}{2}\\x&=\frac {1}{2}÷0.25\\x&=2\end{aligned}$

$=\frac {5}{7}×11.3+2.7×\frac {5}{7}$

$=\frac {5}{7}×(11.3+2.7)$

$=\frac {5}{7}×14$

$=10$

$ =(200+1)×\frac {17}{25}$

$ =136+\frac {17}{25}$

$ =136\frac {17}{25}$

$=\frac {2}{15}÷(\frac {2}{5}－\frac {3}{10})$

$=\frac {2}{15}÷\frac {1}{10}$

$=\frac {2}{15}×10$

$=\frac {4}{3}$