一、口算。
$62.5\% +\frac {5}{8}=$
$69\% ×\frac {1}{3}=$
$50×20\% =$
$1-12.4\% =$
$\frac {2}{3}×\frac {7}{8}=$
$20\% ÷0.6=$
$70\% ×\frac {15}{7}=$
$16×40\% =$
$70\% -\frac {1}{4}=$
$14\% +1.6\% =$
$30÷15\% =$
$25\% ×\frac {5}{3}=$
$66\% ×\frac {5}{11}=$
$2.3+70\% =$
$66\% ×\frac {10}{11}=$
$33\% ×\frac {100}{3}=$
$1-11\% =$
$125\% ×2=$
$40×30\% =$
$3.5÷5\% =$
$\frac {1}{5}×50\% =$

一、1.25 0.23 10 0.876 $\frac{7}{12}$ $\frac{1}{3}$ $\frac{3}{2}$ 6.4 0.45 0.156 200 $\frac{5}{12}$ 0.3 3 $\frac{3}{5}$ 11 0.89 2.5 12 70 0.1

二、计算下面各题。
$125\% ×88$
$(\frac {2}{7}×50\% -\frac {1}{14})×\frac {14}{19}$
$(\frac {2}{3}-\frac {2}{7})×21\% $
$120\% ×\frac {5}{6}+\frac {1}{3}×75\% $
$\frac {8}{15}×75\% -\frac {1}{6}÷\frac {1}{2}$
$\frac {7}{8}÷[(50\% +60\% )×\frac {5}{11}]$

二、110 $\frac{1}{19}$ $\frac{2}{25}$ $1\frac{1}{4}$ $\frac{1}{15}$ $\frac{7}{4}$

1. $125\% × 88$
$\begin{aligned}&=1.25×88\\&=1.25×(80 + 8)\\&=1.25×80+1.25×8\\&=100 + 10\\&=110\end{aligned}$
2. $(\frac{2}{7}×50\%-\frac{1}{14})×\frac{14}{19}$
$\begin{aligned}&=(\frac{2}{7}×\frac{1}{2}-\frac{1}{14})×\frac{14}{19}\\&=(\frac{1}{7}-\frac{1}{14})×\frac{14}{19}\\&=(\frac{2}{14}-\frac{1}{14})×\frac{14}{19}\\&=\frac{1}{14}×\frac{14}{19}\\&=\frac{1}{19}\end{aligned}$
3. $(\frac{2}{3}-\frac{2}{7})×21\%$
$\begin{aligned}&=(\frac{14}{21}-\frac{6}{21})×0.21\\&=\frac{8}{21}×0.21\\&=\frac{8}{21}×\frac{21}{100}\\&=\frac{8}{100}\\&=\frac{2}{25}\end{aligned}$
4. $120\%×\frac{5}{6}+\frac{1}{3}×75\%$
$\begin{aligned}&=1.2×\frac{5}{6}+\frac{1}{3}×0.75\\&=1+\frac{1}{3}×\frac{3}{4}\\&=1+\frac{1}{4}\\&=1\frac{1}{4}\end{aligned}$
5. $\frac{8}{15}×75\%-\frac{1}{6}÷\frac{1}{2}$
$\begin{aligned}&=\frac{8}{15}×\frac{3}{4}-\frac{1}{6}×2\\&=\frac{2}{5}-\frac{1}{3}\\&=\frac{6}{15}-\frac{5}{15}\\&=\frac{1}{15}\end{aligned}$
6. $\frac{7}{8}÷[(50\% + 60\%)×\frac{5}{11}]$
$\begin{aligned}&=\frac{7}{8}÷[(0.5 + 0.6)×\frac{5}{11}]\\&=\frac{7}{8}÷[1.1×\frac{5}{11}]\\&=\frac{7}{8}÷[\frac{11}{10}×\frac{5}{11}]\\&=\frac{7}{8}÷\frac{1}{2}\\&=\frac{7}{8}×2\\&=\frac{7}{4}\end{aligned}$