X减Y分之X的平方减X减Y分之Y的平方,其中X等于1加2倍根号3-搜答案-拍题作业网

x/y=3x=3y(x^2+y^2-xy)/(x^2-y^2)=(9y^2+y^2-3y^2)/(9y^2-y^2)=7y^2/8y^2=7/8

你说对了,参考答案有问题,那个也是人做的,也有出错的时候

通分为分母是（x+y)⒉(x-y),即为2xy（x-y）/（x+y)⒉(x-y)和x（x+y）/（x+y)⒉(x-y)

前者分子：x^2-y^2=(x+y)(x-y)那前面这项就可以化简约分啦后者分子：4x^2-4xy+y^2=(2x)^2-2*2xy+y^2=(2x-y)^2建议你理解一下x^2-2xy+y^=(x-

1/(x-y)=5x-y=1/5x/y=6则x=6y所以x-y=6y-y=1/5y=1/25,x=6/25所以原式=1/(36/625+1/625)=625/37

x^2+y^2-6x-8y+25=0变为：(x^2-6y+9)+(y^2-8y+16)=0(x-3)^2+(y-4)^2=0即：(x-3)^2=0,且(y-4)^2=0所以：x=3,y=4因此：y/x

x/y=2所以x=2y所以xy=2y²x²=4y²(x²-xy+3y²)/(x²+xy+6y²)=(4y²-2y&sup

2分之1X加【2分之3X加3分之1Y的平方】减【2X减3分之2Y的平方】=1/2x+3/2x+1/3y²-2x+2/3y²=y²

x+y分之x-y=2求x+y分之3x-3y减x-y分之2(x+y)的值x+y分之x-y=2x-y=2(x+y)(x+y)分之(3x-3y)-(x-y)分之2(x+y)的值x+y分之3x-3y=(x+y

如果题目是:"x的平方减xy分之y加y的平方减xy分之x",那么就是你的那个答案.y/(x^2-xy)+x/(y^2-xy)=y/[x(x-y)]+x/[y(y-x)]=y^2/[xy(x-y)]-x

如果问题写清楚一些就好啦

3∵x/y=1/2∴y=2x故（x^2+2xy+y^2)/(x^2-xy+y^2)=(x+y)^2/(x^2-xy+y^2)=(x+2x)^2/(x^2-x·2x+4x^2)=9x^2/(3x^2)=

解题思路：把分式的分子分母分解因式再根据法则进行计算，能约分的要先约分解题过程：答案见附件

x^2+y^2-10x-12y+61=(x-5)^2+(y-6)^2=0,——》x=5,y=6,——》x/y-y/x=5/6-6/5=-11/30.

拍张图片再问：再答：再答：有数学题可以求助我

原式=[(x+y)/(x-y)]^2*[2(x-y)/5(x+y)-[X/(x^2y^2)]/[x/(x+y)]=2/5-[x/(x^2y^2)]*[(X+y)/x]=2/5-(x^2y^2)/(x+

原式=[x/(x-y)]*[y^2/(x+y)]-[x^4y/(x^2+y^2)(x^2-y^2)]/[x^2/(x^2+y^2)]=xy^2/(x^2-y^2)-x^2y/(x^2-y^2)=xy(

解x-3y=0x=3y(4xy)/(x²-y²)-(x+y)/(x-y)=(4xy)/(x+y)(x-y)-(x+y)²/(x-y)(x+y)=(4xy-x²-