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（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
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
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
[2/3x-2/x+y(x+y/3x-x-y)]/x-y/x
化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x
计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x
化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x
化简y(x+y)+(x+y)(x-y)-x^2
计算：x+2y/x-y+2x/y-x-3y/x-y
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)
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【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
因式分解x(x+y)(x-y)-x(x+y)^2
2X(2X-3Y)-3Y(X+Y)
(-2x y)^2-(3y-x)(-x-3y)
（x+2y)^2-(x+y)(3x-y)
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化简:5(x-y)+2(x+y)-3(x-y)