计算下列各题，怎样简便就怎样计算．
4.8×0.25
1.55×105
11.2×2.5+0.8×2.5
12.5×8.9-4.9×12.5
7.08×0.4×12.5
7.5×（10+0.1）

计算．

9.4×6.1×2.3	5.67×0.21-0.62	3.25×4.7-7.8
7.2×0.1×2.8	18.1×0.92+3.93	0.43×0.24+0.875．