Question

已知1/a+1/b=4，则(a+2ab+b)/(a-ab+b)的值为多少？过程也要``

Answer 1

1/a+1/b=(a+b)/ab=4
所以a+b=4ab
原式=(2ab+4ab)/3ab=2

Answer 2

1/a+1/b=4
(a+b)/ab=4
a+b=4ab

(a+2ab+b)/(a-ab+b)
=6ab/3ab
=2