{(2x y)的平方-y(y 2x)-8x}除以2x,其中x=1,y=2
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解xy²-2xy-y²+x+2y-1=xy²-2xy+x-y²+2y-1=x(y²-2y+1)-(y²-2y+1)=(x-1)(y-1)
(x的平方+2xy+y的平方)(x的平方-xy+y的平方)的平方=(x²+2xy+y²)(x²-xy+y²)²=(x+y)²(x²
=(2xy-x+y)(2xy-x-y)
再问:过程有木有
xy(xy+1)+(xy+3)-2(x+y+1/2)-(x+y-1)^2=xy(xy+1)+(xy+1)+2-2(x+y)-1-[(x+y)^2-2(x+y)+1]=(xy+1)^2+2-2(x+y)
y/(x²-xy)+2/(y-x)-x/(y²-xy)=[y²+2(-xy)+x²]/(x²y-xy²)=(x-y)²/[(x-y
Y^2(2X+1)(X-3)
2xy/(y^2/x)=2xy÷(y^2/x)=2xy×(x/y^2)=2x^2/y再问:O(∩_∩)O谢谢
((x-y)(x-y))/((x-y)(x+y))=(x-y)/(x+y).
x的平方-2xy/xy-2y的平方=x(x-2y)/y(x-2y)=x/y
原式=-(x²+2xy+y²)=-(x+y)²
2xy-x^2-y^2=-(x^2-2xy+y^2)=-(x-y)^2
原式(-xy/3)²*[xy(2x-y)-2x(xy-y²)]=(x²y²/9)(2x²y-xy²-2x²y+2xy²)
解2xy×(-x²y)=-2x³y²a³b²/3×(-3ab²/2)²——这个吗=a³b²/3×(9a
根据比例的基本性质,得2(3x-4y)=2x+y,4x=9y,则xy=94,故填94.
(x的平方-2xy)的平方+2y的平方(x的平方-2xy)+y的4次方=(x^2-2xy+y^2)^2=(x-y)^4
x的平方-2xy+y的平方-4=(x-y)²-2²=(x-y+2)(x-y-2)再问:(3a-7)的平方-(a+5)的平方这个呢?再答:(3a-7)的平方-(a+5)的平方=(3a
(x平方+2xy+y的平方)/(x+y)=(x+y)²/(x+y)=x+y