(1/11+1/12+1/13+1/14+1/15)×(1/12+1/13+1/14+1/15+1/16)-(1/11+1/12+1/13+1/14+1/15

问题描述:

(1/11+1/12+1/13+1/14+1/15)×(1/12+1/13+1/14+1/15+1/16)-(1/11+1/12+1/13+1/14+1/15

令a=1/12+1/13+1/14+1/15
原式=(1/11+a)(a+1/16)-(1/11+a+1/16)a
=(1/11+a)a+1/16(1/11+a)-(1/11+a)a-1/16a
=1/16(1/11+a)-1/16a
=1/176+1/16a-1/16a
=1/176