Question

已知(a+b)^2=16,ab=4,求a^2+b^2/3与(a-b)^2的值

很着急，快一点，O(∩_∩)O谢谢，会再加分的~~

Answer 1

(a+b)²=16,ab=4
所以
a²+b²
=(a+b)²-2ab
=16-8
=8
(a²+b²)/3=8/3

(a-b)²
=(a+b)²-4ab
=16-16
=0