X减去y等于X除以y-搜答案-搜搜做题作业网

x/(y-x)

x*x-y*y-x*y=0两边同时除以y方,得(x/y)方-(x/y)-1=0,设(x/y)=u,则原方程为u方-u-1=0解得u=(1+根号5)/2或u=(1-根号5)/2即x/y=(1+根号5)/

由x-y除以x+2y等于三分之一,得,(x-y)/(x+2y)=1/33(x-y)=x+2y3x-3y=x+2y,3x-x=2y+3y2x=5y解得x=5y/2所以求x-2y除以x+y=(x-2y)/

2X-Y/X+Y=2X+Y/2X-Y=1/2原式＝[2(2X-Y)/X+Y]-[4(X+Y)/2X-Y]=2*2-4*(1/2)=4-2=2P.S.第一次为团队答题,好鸡东哦o(∩_∩)o有什么不懂的

x²/25-y²/16=1a=5,b=4,c=√41e=c/a=(√41)/5焦点坐标(√41,0),(-√41,0)顶点坐标(5,0),(-5,0)x²/5-y

x=y*y/(y-1)y=4x=16/3y=5x=25/4y=6x=36/5...

x、y互为倒数,则x与y有三个情况.1.当x＞0时如：x=2,则y=1/2,所以x÷y=2÷（1/2）=4,所以x÷y=x²2.当x=0时则x÷y=0÷0=0,故没有意义,所以舍去3.当x＜

x+y=7y=7-xxy=x(7-x)=12x=3或4x=3,y=4或x=4,y=3x-y=1或-1

x/(x+y)=zx=xz+yzx-xz=yzx(1-z)=yzx=yz/(1-z)

4（x+y)-3(x-y)=14x+7y=14(x+y)/2+(x-y)/3=6两边同乘以6,得3(x+y)+2(x-y)=365x+y=36则x+7(36-5x)=14x=7,y=1

x-y/x+y=1/2设：x=3y=1代入可得：（y-x/x+y）-（2x+2y／x-y）=-4(1/2)

c=√(a²+b²)e1=c/a,e2=c/be1+e2=c*(1/a+1/b)=c(a+b)/(ab)(e1+e2)²=c²*(a+b)²/(a&#

x=6y,3x-y=18y-y=6,y=6/17,x=17

x+y-7=-6x^2-x=13y^2-y=13两式相减x^2-y^2-x+y=0(x+y)(x-y)-(x-y)=0(x-y)(x+y-1)=0因为x≠y所以x-y≠0所以x+y-1=0x+y-7=

B

x^2+9y^2-8xy=0(x-9y)(x+y)=0x=9yx=-y1)x=9y(x+3y)(x-3y)=12/6=22)x=-y(x+3y)(x-3y)=2/(-4)=-1/2再问：做错了……再答

[(x²-y²)²/(x+y)²]/(x-y)=[(x+y)(x-y)/(x+y)]²/(x-y)=(x-y)²/(x-y)=x-y如果不懂

答案见图片

题目是不是(x^3+y^3)/(x+y)?应该等于x^2+xy+y^2