14．计算下面各题，能简算的要简算．
| 2.5×3.9×0.4 | 63.4÷2.5÷0.4 | 0.8×6.8+3.2×0.8 |
| 102×0.15 | 0.8×（12.5+1.25） | 84÷5.6-个4.6 |
11．口算．
| 3.5×0.2= | 0.99÷0.1= | 0.63÷0.7= | 13.5÷2.5×0= |
| 1÷0.5= | 1.02×4= | 2b-0.2b= | 9.1×5÷9.1×5= |
6．口算：
0 164974 164982 164988 164992 164998 165000 165004 165010 165012 165018 165024 165028 165030 165034 165040 165042 165048 165052 165054 165058 165060 165064 165066 165068 165069 165070 165072 165073 165074 165076 165078 165082 165084 165088 165090 165094 165100 165102 165108 165112 165114 165118 165124 165130 165132 165138 165142 165144 165150 165154 165160 165168 199269
| 0.5×0.02= | 1.23÷3= | 2.4×2.5= | 4×（1.5+0.25）= |
| 16÷1.6= | 0.7÷0.01= | 99×0.25= | 12×0.4+0.4×13= |