计算下面各题（能简便的用简便方法计算）．
10.15﹣10.75×0.4﹣5.7        
5.8×（3.87﹣0.13）+4.2×3.74
32.52﹣（6+9.728）÷3.2×2.5
[（7.1﹣5.6）×0.9﹣1.15]÷2.5
5.4÷[2.6×（3.7﹣2.9）+0.62]
[20﹣（90.75÷6.6+2.25）]×11.6．