1.直接写出得数。（每题1★）
$\frac{1}{2} - \frac{1}{6} =$
$\frac{7}{10} × \frac{15}{28} =$
$\frac{4}{5} + \frac{5}{4} =$
$\frac{4}{9} ÷ \frac{8}{27} =$
$\frac{5}{12} × 36 =$
$1 ÷ \frac{6}{11} =$
$\frac{4}{9} × \frac{3}{10} =$
$0.4 ÷ \frac{4}{5} =$

1.$\frac{1}{3}$ $\frac{3}{8}$ $\frac{41}{20}$ $\frac{3}{2}$
15 $\frac{11}{6}$ $\frac{2}{15}$ 0.5

2.计算下面各题,能简算的要简算。(每题2 ⭐)
$\frac{4}{7} - \frac{2}{5} + \frac{3}{5}$
$\frac{13}{5} - \frac{3}{7} - \frac{4}{7}$
$\frac{9}{5} + \frac{7}{9} - \frac{2}{9} + \frac{6}{5}$
$\frac{2}{3} + \frac{3}{4} - \frac{1}{6}$
$\frac{7}{10} + \frac{7}{12} - \frac{7}{10}$
$0.87 - \frac{1}{5} + 6.13 - \frac{4}{5}$

1.$\frac{27}{35}$ 2.$\frac{8}{5}$ 3.$\frac{32}{9}$
4.$\frac{5}{4}$ 5.$\frac{7}{12}$ 6.6

识别出错

1.$x=\frac{7}{8}$ 2.$x=8$ 3.$x=0.5$
4.$x=40$ 5.$x=\frac{5}{3}$ 6.$x=\frac{5}{72}$