四、计算下面各题,能用简便算法的就用简便算法。(每题4分,共36分)
$\frac{2}{3} + \frac{14}{9} ÷ \frac{7}{30}$
$\frac{7}{8} ÷ ( \frac{7}{8} + \frac{3}{4} )$
$\frac{11}{8} + \frac{18}{49} ÷ \frac{6}{7} + \frac{4}{7}$
$0.25 ÷ \frac{11}{6} ÷ \frac{1}{4}$
$( \frac{7}{12} - \frac{1}{8} ) ÷ \frac{1}{12} × \frac{2}{5}$
$2 - \frac{15}{16} ÷ \frac{5}{7} ÷ \frac{3}{4}$
$0.28 × \frac{8}{11} + 0.28 ÷ \frac{11}{3}$
$( \frac{3}{5} + \frac{3}{10} ) ÷ ( 1 - \frac{1}{10} )$
$36 × ( \frac{1}{4} + \frac{1}{6} + \frac{1}{9} )$

$\frac{22}{3}$、$\frac{7}{13}$、$\frac{19}{8}$、
$\frac{6}{11}$、$\frac{11}{5}$、$\frac{1}{4}$、
0.28、1、19

五、看图列式计算。(每题4.5分,共9分)
1.
2.

1. $100×\frac{3}{5}=60$(米)
2. $54÷(1-\frac{4}{7})=126(\mathrm{kg})$

计算:$\frac{232323}{565656} ÷ \frac{230230}{560560}$。(共5分)

$\frac{232323}{565656} ÷ \frac{230230}{560560}$
$=\frac{23×10101}{56×10101} ÷ \frac{23×10010}{56×10010}$
$=\frac{23}{56} ÷ \frac{23}{56}$
$=1$