原式=[(129/12-59/12)*29/11]/(27/24+2/24)*(9/4)/120*11
=(70/12*29/11)/(29/24)*(9/4)/120*11
=2.625问一下你会不会第二题？或第一题的简便算法？1×3×24+2×6×48+3×9×72 /(1×2×4+2×4×8+3×6×12)=[1×3×24×(1+2×2×2+3×3×3)]/[1×2×4×(1+2×2×2+3×3×3)]=(1×3×24)/(1×2×4)=9其实掌握两题的重点都在于提出公共的部分，然后分子分母相消