已知a-b=2,则2/1a^2-ab+2/1b^2=

问题描述:

已知a-b=2,则2/1a^2-ab+2/1b^2=
快!

2/1a^2-ab+2/1b^2
=2/1(a^2-2ab+b^2)
=2/1(a-b)^2
=2/1×2^2
=2