(x+2y)^2-x^2-12(x-2y)^2+4y^2

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(x+2y)^2-x^2-12(x-2y)^2+4y^2

(x+2y)^2-x^2-12(x-2y)^2+4y^2
(x+2y)^2-x^2-12(x-2y)^2+4y^2

(x+2y)^2-x^2-12(x-2y)^2+4y^2
(x+2y)^2-x^2-12(x-2y)^2+4y^2
=(x+2y-x)(x+2y+x)-12(x-2y)^2+4y^2
=2y(2x+2y)-12(x-2y)^2+4y^2
=4y(x+y)+4y^2-12(x-2y)^2
=4(xy+y^2+y^2)-12(x^2-4xy+4y^2)
=4(xy+2y^2-3x^2+12xy-12y^2)
=4(13xy-3x^2-10y^2)


原式=x^2 +4xy+4y^2 -x^2 -12(x^2 -4xy+4y^2)+4y^2
=4xy+4y^2-12x^2+48xy-48y^2+4y^2
=52xy-40y^2 -12x^2

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简y(x+y)+(x+y)(x-y)-x^2 因式分解x(x+y)(x-y)-x(x+y)^2 (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) x^2(x-y)+(y-x) x(x-y)2-(y-x)3 (x-y)^2+12(x-y)+36 9(x-y)-12(y-x)^2 【(x-y)^2+(x+y)(x-y)】除以 2x 计算:y-x分之x+y+x-y分之y-y-x分之2x-y [(x-y)²+(x+y)(x-y)]除以2x [(x-y)^2-(x+2y)(x-2y)]/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 计算[2x^2-(x+y)(x-y)][(-x-y)(y-x)+2y^2]