若1/a+1/b=5,则(a+2ab+b)/ab的值为5 6 7 8
问题描述：
若1/a+1/b=5,则(a+2ab+b)/ab的值为
5 6 7 8
答
(a+2ab+b)/ab=1/b+2+1/a=5+2=7
答
(a+2ab+b)/ab
=a/ab+2ab/ab+b/ab
=1/b+2+1/a
=5+2
=7