作业帮先化简 2X^2+Y^2（2Y^2-3X^2）-2（Y^2-2X^2）,其中X=-1,Y=22X^2+Y^2（2Y^2-3X^2）-2（Y^2-2X^2）,其中X=-1，Y=2
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先化简 2X^2+Y^2（2Y^2-3X^2）-2（Y^2-2X^2）,其中X=-1,Y=22X^2+Y^2（2Y^2-3X^2）-2（Y^2-2X^2）,其中X=-1，Y=2
先化简 2X^2+Y^2（2Y^2-3X^2）-2（Y^2-2X^2）,其中X=-1,Y=2
2X^2+Y^2（2Y^2-3X^2）-2（Y^2-2X^2）,其中X=-1，Y=2
先化简 2X^2+Y^2（2Y^2-3X^2）-2（Y^2-2X^2）,其中X=-1,Y=22X^2+Y^2（2Y^2-3X^2）-2（Y^2-2X^2）,其中X=-1，Y=2
原式=2X^2+2Y^4-3X^2Y^2-2Y^2+4X^2
=6X^2+2Y^4-2Y^2-3X^2Y^2
=6+2*16-2*4-3*4
=6+32-8-12
=18
x(x-y)2-(y-x)3
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