4(x+y)2-9(2x-3y)2

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4(x+y)2-9(2x-3y)24(x+y)2-9(2x-3y)24(x+y)2-9(2x-3y)24(x+y)2-9(2x-3y)2=[2(x+y)]²-[3(2x-3y)]²

4(x+y)2-9(2x-3y)2
4(x+y)2-9(2x-3y)2

4(x+y)2-9(2x-3y)2
4(x+y)2-9(2x-3y)2
=[2(x+y)]² - [3(2x-3y)]²
=(2x+2y+6x-9y)(2x+2y-6x+9y)
=(8x-7y)(11y-4x)
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4（x+y）²-9（2x-3y）²
=(2x+2y)²-（6x-9y）²
=（2x+2y+6x-9y）（2x+2y-6x+9y）
=（8x-7y）（11y-4x）

=[2(x+y)]²-[3(2x-3y)]²
=[2(x+y)+3(2x-3y)][2(x+y)-3(2x-3y)]
=(8x-7y)(-4x+11y)
=-(8x-7y)(4x-11y)

81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2 3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (x+3y-4)(2x-y) 计算（2x-3y)(x+4y)-(3x+y)(x-2y)（2x-3y)(x+4y)-(3x+y)(x-2y) 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² (2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y) x(x-y)2-(y-x)3 （4x-3y)(5x+2y)-2x(9x-5y) 等于多少 9y=3x-(x-1),4(x+y)-(2x+4)=8y 根据3（x+y)-2(x-y)=11,4(x+y)+3(x-y)=9可得出x+y= ,x-y= [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 [(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y