已知a+b=6 ab=7则a^2-3ab+b^2=_____
问题描述:
已知a+b=6 ab=7则a^2-3ab+b^2=_____
答
a^2-3ab+b^2
=a²+2ab+b²-5ab
=(a+b)²-5ab
=6²-35
=36-35
=1