脱式计算．
96÷（15.4﹣12.2）        9÷[0.3×（8﹣6.5）]            0.175÷0.25÷0.4
0.175÷0.25×4            0.36÷[（6.1﹣4.6）×0.8]       3.6×0.4+1.2×5．