已知a+b=2,求a^2+2ab+b^2-10a-10b+25的值
问题描述:
已知a+b=2,求a^2+2ab+b^2-10a-10b+25的值
答
a+b=2
a²+2ab+b²-10a-10b+25
=(a+b)²-10(a+b)+25
=2²-10*2+25
=4-20+25
=9