1.用简便算法计算下面各题。(2)/(9) - (7)/(16) times (2)/(9)(2)/(5) times 4 times (3)/(4)(5)/(7) times 16 times (21)/(5)(1)/(2) times (1)/(15) + (1)/(3) times (1)/(2)(4)/(5) times (7)/(9) times (5)/(8)(5)/(6) times (5)/(9) + (5)/(9) times (1)/(6)

1.用简便算法计算下面各题。 $\frac{2}{9} - \frac{7}{16} \times \frac{2}{9}$ $\frac{2}{5} \times 4 \times \frac{3}{4}$ $\frac{5}{7} \times 16 \times \frac{21}{5}$ $\frac{1}{2} \times \frac{1}{15} + \frac{1}{3} \times \frac{1}{2}$ $\frac{4}{5} \times \frac{7}{9} \times \frac{5}{8}$ $\frac{5}{6} \times \frac{5}{9} + \frac{5}{9} \times \frac{1}{6}$

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