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第15页

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10.2

$\dfrac{1}{6}$

1.4

$\dfrac{9}{2}$

$\dfrac{1}{24}$

300

0.008

$\dfrac{16}{7}$

=0.7×(1+99)

=0.7×100

=70

 =4×0.25×1.2

 =1×1.2

 =1.2

 =(1.3+8.7)-$(\dfrac{1}{5}+\dfrac{9}{5})$

 =10-2

=8

 =17×$\dfrac{4}{3}$-8×$\dfrac{4}{3}$

 =(17-8)×$\dfrac{4}{3}$

 =9×$\dfrac{4}{3}$

=12

=$\dfrac{3}{4}$×48 - $\dfrac{1}{6}$×48 + $\dfrac{3}{8}$×48

=36-8+18

=46

 =$\dfrac{9}{10}÷[(\dfrac{3}{4}+\dfrac{3}{8})×\dfrac{2}{3}]$

 =$\dfrac{9}{10}÷(\dfrac{9}{8}×\dfrac{2}{3})$

 =$\dfrac{9}{10}÷\dfrac{3}{4}$

 =$\dfrac{6}{5}$

 $\begin{aligned}解：x+12.5\%x&=45\\1.125x&=45\\x&=40\end{aligned}$

 $\begin{aligned}解：\dfrac{4}{5}x÷\dfrac{2}{3}&=\dfrac{6}{7}\\\dfrac{4}{5}x&=\dfrac{6}{7}×\dfrac{2}{3}\\\dfrac{4}{5}x&=\dfrac{4}{7}\\x&=\dfrac{5}{7}\end{aligned}$