计算下面各题，能简算的要简算．
1.29+3.7+2.71+6.3       3.75÷[0.3×（1.34﹣0.84）]       7.2×7.2+7.2×2.8
0.25×0.8×0.125×4     25×10.8×0.04                    15.32﹣1.8×5﹣3.46．