(xy-x的平方)乘以x-y分之xy-搜答案-搜搜考试网

当x>y时答案是2分之5当xy时x-y=2y当x

由x-3y=0可知x=3y原式=(2x+y)(x-y)/(x-y)²=(2x+y)/(x-y)=(6y+y)/(3y-y)=7y/2y=7/2

x/y=3所以x=3y(x²+2xy-3y²)/(x²-xy+y²)=(9y²+6y²-3y²)/(9y²-3y&sup

x^3y-2x^2y^2+xy^3=x^3y+2x^2y^2+xy^3-4x^2y^2=xy(x^2+2xy+y^2)-4x^2y^2=xy(x+y)^2-4x^2y^2=12×7×7-4×12×12

式子是这样么(2x+y)/(x^2-2xy+y^2）=(2x+y)/(x-y)^2x-3y=0x=3y代入原式(2*3y+y)/(3y-y)^2=7/4yy不能等于0

(x分之x的平方-y的平方)乘以(x的平方-2xy+y的平方分之2x)其中x=2y=1=(x^2-y^2)/x*2x/(x-y)^2=(x+y)(x-y)/x*2x/(x-y)^2=2(x+y)/(x

对.前提是x不等于y

原式=3分之1*(x²-3xy-10y²)=3分之1*(x-5y)(x+2y)

x-3y=0x=3y原式=(2x+y)(x-y)/(x-y)²=(2x+y)/(x-y)=(6y+y)/(3y-y)=7y/2y=7/2

x的平方+x-6/x-3/x+3/x的平方-6-x=(x+3)(x-2)/(x-3)×(x-3)(x+2)/(x+3)=(x-2)(x+2)=x²-4x的平方+2xy+y的平方/xy-y的平

2xy²+3x³-x²yx降幂就是x的次数越来越低那么变为3x³-x²y+2xy²

=(xy-x的平方）除以(x的平方-2xy+y的平方\xy)乘以(x-y\x的平方)=-x（x-y）×xy/（x-y）²×（x-y）/x²=-y

=(x+2y)(x-2y)/(x+2)²×(x+2)/3x(x+2y)=(x-2y)/3x(x+2)=(x-2y)/(3x²+6x)

没写完,补充,向我追问再问：当x的二次方+4y的二次方-4x+4y+5=0时2x的二次方+xy-y的二次方分之x的四次方-y的四次方乘以xy-y二次方分之2x-y乘以（x二次方+y二次方）的平方分之y

x(y-x)÷(x²-2xy+y²)/xy×(x-y)/x²=-x(x-y)×xy/(x-y)²×(x-y)/x²=-y

2+x^2+(x^2)*(y^2)=2X-2xy,化简得：（x-1)^2+(xy-1)^2=0【把化简前式子中的2分成1+1】所以x-1=0,xy-1=0,得x=y=1【（x-1)^2是（x-1)的平

(-2y/x的平方)的平方乘以(-x/y)除以(2/xy)的四次方=4y²/x^4*(-x/y)÷(2/xy)^4=-4y/x³*(xy)^4÷16=-y的五次方/4x

（2X的平方Y-XY）乘以3XY=6X³Y²-3X²Y²

x九次方y

（x+2y）的平方再问：不对再答：(x-2y)的平方再问：再答：再问：谢谢了再答：不谢，>3