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第81頁

信息發(fā)布者：

10

520

1001

2.05

2000

0

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

3

5

30

9

60

六

???$ \frac {1}{4}$???

???$\frac {3}{4}$???

1:5000000

250

150

鈍

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

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

???$=\frac {5}{7}×11.3+2.7×\frac {5}{7}$???

???$=\frac {5}{7}×(11.3+2.7)$???

???$=\frac {5}{7}×14$???

???$=10$???

?$ ??=(200+1)×\frac {17}{25}??$?

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

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

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

???$=\frac {2}{15}÷\frac {1}{10}$???

???$=\frac {2}{15}×10$???

???$=\frac {4}{3}$???

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