1/2X2/3X3/4.X99/100X100/101简便计算

问题描述:

1/2X2/3X3/4.X99/100X100/101简便计算
我知道结果,但是过程不清楚,请务必写上,

1/2X2/3X3/4.X99/100X100/101
=(1×2×3×.×99×100)/ (2×3×.×100×101)
=[1×(2×3×.×99×100)]/ [(2×3×.×100)×101]
=1/101 {将分子分母里的2×3×.×99×100约掉}