已知-x+y=3,则2(x-y)2次方-4(x-y)+6
问题描述:
已知-x+y=3,则2(x-y)2次方-4(x-y)+6
答
-x+y=3
x-y=-3
2(x-y)2次方-4(x-y)+6
=2*(-3)^2-4*(-3)+6
=2*9+12+6
=18+12+6
=36