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第22页

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1024

0.09

$2\frac{1}{2}$

15.8

$\frac {24}{7}$

$1\frac{1}{4}$

=12.5×8×4×2.5

=100×10

=1000

=2.3+3.91÷2.3

=2.3+1.7

=720÷(15×6)

=720÷90

$=\frac {2}{5}÷\frac {1}{2}$

$=\frac {4}{5}$

$=\frac {3}{4}×(\frac {2}{5}+\frac {3}{5})$

$=\frac {3}{4}×1$

$=\frac {3}{4}$

=1.7×101-1.7

=171.7-1.7

=170

$\begin{aligned}解：0.25x&=0.8\\x&=3.2\end{aligned}$

$\begin{aligned}解：25x&=0.75×8\\25x&=6\\x&=0.24\end{aligned}$

$\begin{aligned}解：\frac {1}{5}x&=10\\x&=50\end{aligned}$

$ \begin{aligned}解：0.21x&=2.8×0.6 \\ 0.21x&=1.68 \\ x&=8 \\ \end{aligned}$

362000000

36200

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