l1/1010-1/1009l+l1/1009-1/1008l-l1/1010-1/1008l怎么计算

问题描述:

l1/1010-1/1009l+l1/1009-1/1008l-l1/1010-1/1008l怎么计算

原式=1/1009-1/1010+1/1008-1/1009-1/1008+1/1010
=0