若a+b=8,a^2-b^2=24求a-b

问题描述:

若a+b=8,a^2-b^2=24求a-b

-b
=(a^2-b^2)/(a+b)
=24/8
=3
(a+b)^2-(a-b)^2=4ab
=8^2-4^2
=48
ab=48/4=1248除316