18．下列各题怎样算简便就怎样算．
0 165041 165049 165055 165059 165065 165067 165071 165077 165079 165085 165091 165095 165097 165101 165107 165109 165115 165119 165121 165125 165127 165131 165133 165135 165136 165137 165139 165140 165141 165143 165145 165149 165151 165155 165157 165161 165167 165169 165175 165179 165181 165185 165191 165197 165199 165205 165209 165211 165217 165221 165227 165235 199269
| $\frac{1}{4}$+$\frac{3}{4}$×$\frac{8}{15}$ | 2-$\frac{3}{4}$÷$\frac{9}{10}$ | $\frac{5}{12}$÷9+$\frac{1}{9}$×$\frac{7}{12}$ |
| （$\frac{5}{6}$-$\frac{3}{5}$）÷$\frac{1}{30}$ | 10-（$\frac{2}{5}$+$\frac{3}{5}$×2） | $\frac{3}{5}$×[（2-0.6）÷$\frac{7}{15}$]． |
