(2+1/3+1/4+1/5)×(1/3+1/4+1/5+1/6)—(2+1/3+1/4+1/5+1/6)×(1/3+1/4+1/5)怎么算?
问题描述：
(2+1/3+1/4+1/5)×(1/3+1/4+1/5+1/6)—(2+1/3+1/4+1/5+1/6)×(1/3+1/4+1/5)怎么算?
答
aX1/6-1/6b=1/6x(a-b)=1/6x[(1/2+1/3+1/4+1/5)-(1/3+1/4+1/5)]=1/6x1/2=1/12
以上回答你满意么?不套公式怎们算