原式=3/2x4/3x5/4x2/3=(3/2x2/3)x4/3x5/4=1x5/3=5/3=1又2/3供参考。
(1+1/2)x(1+1/3)x(1十1/4)x(1一1/3)＝3／2 × 4／3 × 5／4 × 2／3＝5／3
=3/2*4/3*5/4*2/3=5*3
