2x平方y-8y
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(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y)=(x+y)(x-y)/(x+y)+(x-y)^2/(x-y)=x-y+x-y=2(x-y)
x^2=x的平方‘/’为除以[(x+2y)^2-(x+y)(x-y)-5y^2]/(2x)=[(x^2+4xy+4y^2)-(x^2-y^2)-5y^2]/(2x)=[4xy]/(2x)=2y[(3x
原式=x²-y²-(4x²y²+12xy²+9y²)=x²-y²-4x²y²-12xy²-
4X^2+4Y^2+4X+8Y+5=0,即:(2X+1)^2+(^2Y+2)^2=0∴2X+1=0;2Y+2=0X=-1/2;Y=-1.所求式子=(4XY-2Y^2)/(2Y)=2X-Y=-1+1=0
x平方+2xy-8y平方=0(x+4y)(x-2y)=0x=-4y或x=2y(1)当x=-4y(x-y)/(x+y)=(-5)/(-3)=5/3(2)当x=2y(x-y)/(x+y)=1/3
2(y-x)²-7(x-y)+6(x-y)-3(y-x)²=-(y-x)²-(x-y)=-(x-y)²-(x-y)=-(x-y)[(x-y)+1]=(y-x)(
-2x立方y平方+8x平方2y平方=-2x立方y平方+32x平方y平方=-2x平方y平方(x-16)
(x-y)^2-8(x-y-2)=(x-y)^2-8(x-y)+16=[(x-y)-4]^2=(x-y-4)^2
x=-3y=4式子等于-49/12
设a=x-y,b=y-z,-a-b=z-x(y-z)平方+(x-y)平方+(z-x)平方=(y+z-2x)平方+(z+x-2y)平方+(x+y-2z)平方b^2+a^2+(-a-b)^2=(-a-b-
原式=-2x²y^6+20x²y³再问:还在吗再答:嗯有新的题请采纳我,重新问再问:(x+3y)(2x-y)谢谢再答:采纳我,重新问
(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方=x²-2xy-3y²-x²+4y²-x²+2xy-y²=(x²-
乘出来(x^2+2xy+y^2-2xy-y^2-8x)÷2x=(x^2-8x)÷2x=x^2÷2x-8x÷2x=x/2-4
(x-y)平方+2y(x-y)=(x-y)(x-y+2y)=(x-y)(x+y)
{(x的平方+y的平方)-(x的平方-y的平方)+2y(x-y)}除4y=(2y^2+2y(x-y)/(4y)=2xy/(4y)=x/2
【2(x-y)²-8(x-y)²(x+y)+6y(x-y)²】÷2(x-y)²=2(x-y)²÷2(x-y)²-8(x-y)²(x
x8+256y8-32x4y4(用手机打的不要介意,给个最佳答案吧)
xy+y平方+x-y-2=xy+x+y^2-y-2=x(y+1)+(y+1)(y-2)=(y+1)(x+y-2)
【(x-y)的3次方-8(x-y)的2次方(x+y)+6y(x-y)的平方】/2(x-y)的平方=(x-y)²[x-y-8(x+y)+6y]/2(x-y)²=1/2(x-y-8x-
x的平方-2y+y的平方+8y+17=0(x-1)平方+(y+4)平方=0x=1,y=-4