16.能简算的要简算.
$\frac{10}{11}$×$\frac{1}{13}$×13×11 | $\frac{4}{9}$×$\frac{9}{14}$÷$\frac{4}{21}$ | $\frac{13}{49}$×21+28×$\frac{13}{49}$ | $\frac{3}{4}$-$\frac{4}{5}$×$\frac{5}{6}$ |
($\frac{3}{4}$+$\frac{5}{8}$)×32 | $\frac{1}{5}$+$\frac{2}{9}$×$\frac{3}{10}$ | 72×$\frac{5}{71}$. |
15.右面各算式中计算结果最小的是( )
0 160007 160015 160021 160025 160031 160033 160037 160043 160045 160051 160057 160061 160063 160067 160073 160075 160081 160085 160087 160091 160093 160097 160099 160101 160102 160103 160105 160106 160107 160109 160111 160115 160117 160121 160123 160127 160133 160135 160141 160145 160147 160151 160157 160163 160165 160171 160175 160177 160183 160187 160193 160201 199269
A. | $\frac{9}{10}$÷11 | B. | 11×$\frac{9}{10}$ | C. | 11÷$\frac{9}{10}$ |