9．口算．
0 164972 164980 164986 164990 164996 164998 165002 165008 165010 165016 165022 165026 165028 165032 165038 165040 165046 165050 165052 165056 165058 165062 165064 165066 165067 165068 165070 165071 165072 165074 165076 165080 165082 165086 165088 165092 165098 165100 165106 165110 165112 165116 165122 165128 165130 165136 165140 165142 165148 165152 165158 165166 199269
| 0.001+10.099= | 3-0.98= | 0.24×5= | 0.63÷0.9= |
| 1÷0.2= | 8.95÷0.895= | 3.9×0.01= | 2.5×（4-0.4）= |