(x-y)^2+(x+y)(x-y) 其中 X =3 Y=-1
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(x-y)^2+(x+y)(x-y)其中X=3Y=-1(x-y)^2+(x+y)(x-y)其中X=3Y=-1(x-y)^2+(x+y)(x-y)其中X=3Y=-1(x-y)^2+(x+y)(x-y)=
(x-y)^2+(x+y)(x-y) 其中 X =3 Y=-1
(x-y)^2+(x+y)(x-y) 其中 X =3 Y=-1
(x-y)^2+(x+y)(x-y) 其中 X =3 Y=-1
(x-y)^2+(x+y)(x-y)
=(x-y)(x-y+x+y)
=(x-y)2x
x=3 y=-1 x-y=3+1=4
原式=4×2×3=24
(x-y)^2+(x+y)(x-y)
=(x-y)(x-y+x+y)
=2x(x-y)
=2*3(3+1)
=24
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