Question

当a的平方加b的平方,除以2ab等于2时,求代数式：(7ab除以,a的平方加b的平方),加,(3a的平方加5ab加3b.

Answer 1

a^2+b^2=4ab

原式=(7ab/(a^2+b^2))+((3a^2+5ab+3b^2)/6ab)

=(7ab/4ab)+((3*4ab+5ab)/6ab)

=7/4+(17ab/6ab)

=7/4+17/6

=55/12