3xy²分之x²-4y²乘以x 2y分之xy=?-搜答案-搜搜做题作业网

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

原式=-3xy^2*144y^2/x^2*x^3/216y^6=-2*1/y^2=-2/y^2

[x(x+y)/2(x+2y)]X[3(x-y)/x(x+2y)]X[(x+2y)(x+2y)/3(x+y)(x-y)]=1/2再问：能分开吗再答：[x(x+y)/2(x+2y)]X[3(x-y)/x

【x-y-(x-y分之4y平方)】【x+y-(x+y分之4x平方)】除以【3(x+y)-x-y分之8xy】=（x-y-x+4y)(x+y-x-4x/y)/(3x+3y-x-8x)=3y*(y-4x/y

x减1分之x平方减1,化简为x+1得2005+1=2006第二问不太清楚

XY(XY-X^2)(X-Y)=X^2Y(X-Y)(X-Y)=(X-Y)(X^2Y-1)再问：答案是。-X2Y.我不知道过程是如何来的。能告诉我过程吗。谢谢。负X的平方Y

对.前提是x不等于y

=(2X/3Y)*(3X/4Y)*(4/xy)=(2x*3x*4)/(3y*4y*xy)=2x/(y^3)

因为x-y=4xy所以x-2xy-y=2xy2x+3xy-2y=11xyx-2xy-y分之2x+3xy-2y=5.5

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

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

xy-y^2=y(x-y)=5因为x和y都是正整数,所以y=1y=52/5(xy^3-y^4)=2/5y^2(xy-y^2)=2y^2当y=1时,原式=2当y=5时,原式=50

[3x分之2-（x+y分之2）乘以[3x分之x+（y-x^2-xy）]除以x分之x-y{2/3x-2/(x+y)*[x/3x+(y-x²-xy)]}÷(x-y)/x题目错了吧?再问：{3x分

x^2+4y^2-4x+4y+5=0,(x-2)^2+(2y+1)^2=0,x=2,y=-1/2,(2x^2+xy-y^2分之x^4-y^4)*（xy-y^2分之2x-y)/[(x^2+y^2)/y]

x^2+4y^2-2x+4y+5=0==>(x-1)^2+(2y+1)^3+3=0无解?还是要用到虚数什么的

（xy-x²）÷xy分之x²-2xy+y²乘x²分之x-y=-x(x-y)×xy/(x-y)²×(x-y)/x²=-y∴结果与x的值没有关系

x九次方y

原式=5x根号(xy)/3根号(y/x)*1/3根号(x/y)=5/9*根号(xy*x/y*x/y)=5x/9y根号(xy)