已知:x+y=-5,求5(x-3)+5y+12-3(x+y)的二次方的值

问题描述:

已知:x+y=-5,求5(x-3)+5y+12-3(x+y)的二次方的值

5(x-3)+5y+12-3(x+y)的二次方
=5x-15+5y+12-3(x+y)²
=5(x+y)-3-3(x+y)²
=5×(-5)-3-3×(-5)²
=-103