10分之x平方 6分之y平方=1长轴长,短轴长,焦距,焦点坐标与顶点坐标-搜答案-神马作文网

x/y=2平方x²/y²=4原式分子分母同除以y²所以原式=(x²/y²-x/y+3)/(x²/y²+x/y+6)=(4-2+3)

x平方+x分之7+x平方-x分之3=x平方-1分之61分之6应该就是6吧?x²+7/x+x²-3/x=x²-6x²+x²-x²+7/x-3/

(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

是求X的值吗?不晓得对不对哈,姑且一看吧　　由已知可得：

（x³＋3x²y-9xy²）-1/2（6x²y＋4x²）=x³＋3x²y-9xy²-3x²y-2x²

x平方-x+1=x平方-x分之6-x+1=-x分之6x-x分之6-1=0x平方-x-6=0(x-3)(x+2)=0x-3=0,x+2=0所以,x=3.x=-2

x/y=1/2y=2x(x^2+2xy+y^2)/(x^2-xy+y^2)=(x^2+2x*2x+(2x)^2)/(x^2-x*2x+(2x)^2)=9x^2/3x^2=3

y分之x=2分之1y=2x所以原原式=(x²-2x²-8x²)分之（x²＋4x²＋4x²）=-9分之9=-1

令3分之x=4分之y=6分之z=kx=3k,y=4kz=6k(xy+yz+xz)/(x^2+y^2+z^2)=k^2(12+18+24)/k^2(36+16+9)=54/61

a²=m²+12b²=4-m²c²=a²+b²=16c=4所以焦距=2c=8

[1/(x-y)-1/(x+y)]/[xy^2/(x^2-y^2)]=[(x+y-x+y)/(x-y)(x+y)]/[xy^2/(x-y)(x+y)]=[2y/(x-y)(x+y)]/[xy^2/(x

1.没看懂2.由x/2=y/3知,x=(2y)/3因此(3x+2y)/(2x-3y)=4y/[(4y/3)-3y]=4/(4/3-3)=-12/53.同样把已知条件变形,1/x-1/y=2,可以变为y

（1）6ab/5c^2*10c/3b=4a/c(2)(x^2-4y^2)/(x^2+4x+4)*(x+2)/(3x^2+6xy)=(x+2y)(x-2y)/(x+2)^2*(x+2)/3x(x+2y)

7/x(x+1)-6/(x+1)(x-1)=-1/x(x-1)两边乘以x(x+1)(x-1)得7(x-1)-6x=-(x+1)7x-7-6x=-x-12x=6∴x=3经检验：x=3是方程的解

令3/x=4/y=6/z=1/k则x=3ky=4kz=6k(x²+y²+z²)/(xy+yz+xz)=(9k²+16k²+36k²)/(12

解2xy²-[3xy²-2(x²y-1/2xy²)]-2x²y=2xy²-(3xy²-2x²y+xy²)-2x

（1-y+x分之y）÷y的平方-x的平方分之x=[(y+x-y)/(y+x)]÷x/(y²-x²)=x/(y+x)*[(y+x)(y-x)/x]=y-x

y分之x=2分之1y=2x所以原原式=(x²-2x²-8x²)分之（x²＋4x²＋4x²）=-9分之9=-1

x-y分之2x的平方-y-x分之x的平方-4xy+x-y分之2y的平方-x的平方=2x/(x-y)-(x²-4xy)/(y-x)+(2y-x²)/(x-y)=(2x+x²

y’=[sinx/(1-x²)]'=[(sinx)'(1-x²)-sinx(1-x²)']/(1-x²)²=[cosx(1-x²)+2xsi