当（2a-b/a+b）=5时,求[2(a+b)/a+b]+[3(a+b)/2a-b]的值.

Question

当（2a-b/a+b）=5时,求[2(a+b)/a+b]+[3(a+b)/2a-b]的值.

Answer 1

令a+b=M,2a-b=N,则N/M = 5,N=5M
a+b分之2(2a-b)+2a-b分之3(a+b)
=2N/M + 3M/N
=10+3/5
=10又5分之3