(x平方 2xy-y平方)dx y平方
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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
x平方+3xy+2y平方/x平方y+2xy平方=(x+2y)(x+y)/x(x+2y)=(x+y)/x在我回答的右上角点击【评价】,然后就可以选择【满意,问题已经完美解决】了.
原式=[(x-y)²-(x²-y²)]/2xy=(x²-2xy+y²-x²+y²)/2xy=(-2xy+2y²)/2xy
(3x平方-4y平方)+[-(x平方-2xy-y平方)]-[(3x平方-2xy-y平方)]=3x²-4y²-x²+2xy+y²-3x²+2xy+y
2x方y和3x方y是同类项,剩下两个是同类项,合并后为5x方y和-3x方y
x平方+y平方+2xy分之x平方-4y平方除以x平方+xy分之2y+x=(x-2y)(x+2y)/(x+y)²·x(x+y)/(x+2y)=x(x-2y)/(x+y)
((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(-xy/3)²*[xy(2x-y)-2x(xy-y²)]=(x²y²/9)(2x²y-xy²-2x²y+2xy²)
原式=x^3+2x^2y+xy^2 =x(x^2+2xy+y^2) =x(x+y)^2再问:x-2��֮x-
=(x+y)(x+y)(x^2-xy+y^2)(x^2-xy+y^2)=(x^3+y^3)^2
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)
X²-XY-6Y²+2X-Y+1=(X+1)²-Y(X+1)-6Y²=(X+1-3Y)(X+1+2Y)再问:学生不才老师您第一步我就不知道怎么得到的再答:X2-
a(x²+2xy+y²)-b(x²-y²)=a(x+y)²-b(x+y)(x-y)=(x+y)(ax+ay-bx+by)再问:你确定对吗?和我已开始算
(2X平方y+3xy平方)-(6x平方-3XY平方)=2x²y+3xy²-6x²+3xy²=2x²y+6xy²-6x²
2和3再问:要完整过程!!!~~再答:=。=∵x平方-2xy+y平方=1∴(x-y)平方=1∴x-y=1或x-y=-1。再代入第一个方程里面。算呗
2x平方y-2xy+3xy平方+5+2xy+x平方y-3xy平方-3=2x²y-2xy+3xy²+5+2xy+x²y-3xy²-3=3x²y+2
(3X平方-5Y)+[-3XY-2(X平方-XY)+Y平方]=3X平方-5Y-3XY-2X平方+2XY+Y平方=X平方-5Y-XY+Y平方再问:谢谢你再答:不客气,采纳我哦
(x平方+2xy+y的平方)/(x+y)=(x+y)²/(x+y)=x+y