1.（2x^2+3y)(2x^2-3y) 2.(2x-y)(-2x-y) 3.(b+2a)(2a-b) 4.(2a^2+3b)(2a^2-3b)
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1.（2x^2+3y)(2x^2-3y)2.(2x-y)(-2x-y)3.(b+2a)(2a-b)4.(2a^2+3b)(2a^2-3b)1.（2x^2+3y)(2x^2-3y)2.(2x-y)(-2
1.（2x^2+3y)(2x^2-3y) 2.(2x-y)(-2x-y) 3.(b+2a)(2a-b) 4.(2a^2+3b)(2a^2-3b)
1.（2x^2+3y)(2x^2-3y) 2.(2x-y)(-2x-y) 3.(b+2a)(2a-b) 4.(2a^2+3b)(2a^2-3b)
1.（2x^2+3y)(2x^2-3y) 2.(2x-y)(-2x-y) 3.(b+2a)(2a-b) 4.(2a^2+3b)(2a^2-3b)
(2x^2+3y)(2x^2-3y)
=(2x^2)^2-9y^2
(2x-y)(-2x-y)
=-(4x^2-y^2)
(2a^2+3b)(2a^2-3b)
=(2a^2)^2-9b^2
x(x-y)2-(y-x)3
[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
1.（x+2)^2-(x+y)^32.(x-y)^2-(x-y)^33.(x-y)^2-(y-x)^3
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)
因式分解：a(x-y)^2+b(y-x)^3 4(x-y)^2+8(y-x)(x+y)1.a(x-y)^2+b(y-x)^3 2.4(x-y)^2+8(y-x)(x+y)
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3(x-y)-7(x--y)+2(y-x)
因式分解:3x(x-y)+2y(y-x)