已知a=92,b=96,求a^3-2ab+b^2-10a+10b+25的值
问题描述:
已知a=92,b=96,求a^3-2ab+b^2-10a+10b+25的值
答
a^2-2ab+b^2-10a+10b+25
=(a-b)^2-10(a-b)+25
=(a-b-5)^2
=(92-96-5)^2
=(-9)^2
=81