下面各题，能用简算的要用简便计算．
1.85×2.5+2.15×2.5
81.99÷0.9×0.17
18.26﹣2.35﹣4.65
1.25×32×0.25
31.6÷1.25÷8
4.2÷0.7÷6
21.63﹣13.8×0.15
6.3÷3.5．