已知-x+y=3,则2(x-y)2次方-4(x-y)+6

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已知-x+y=3,则2(x-y)2次方-4(x-y)+6已知-x+y=3,则2(x-y)2次方-4(x-y)+6已知-x+y=3,则2(x-y)2次方-4(x-y)+6-x+y=3x-y=-32(x-

已知-x+y=3,则2(x-y)2次方-4(x-y)+6
已知-x+y=3,则2(x-y)2次方-4(x-y)+6

已知-x+y=3,则2(x-y)2次方-4(x-y)+6
-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

2(x-y)2次方-4(x-y)+6
=2x3^2+4x3+6
=18+12+6
=36

2(x-y)2次方-4(x-y)+6
=2(-3)^2-4(-3)+6
=18+12+6
=36