x平方除以35平方 Y平方除以16平方-搜答案-大师作文网

1-（x-y）/(x+2y)÷(x²-y²)/(x+2y)²=1-(x-y)/(x+2y)×(x+2y)²/(x+y)(x-y)=1-(x+2y)/(x+y)=

原式=[x²－4xy＋﹙2y﹚²－1]／﹙x－2y－1﹚=[﹙x－2y﹚²－1²]／﹙x－2y－1﹚=﹙x－2y＋1﹚﹙x－2y－1﹚／﹙x－2y－1﹚=x－2

1、=y²/16x的6次方×4x的4次方/y²=1/4x²2、=(2a-b)/(a²-9b²)-5b/(a²-9b²)=(2a-6

x^2=x的平方‘/’为除以[(x+2y)^2-(x+y)(x-y)-5y^2]/(2x)=[(x^2+4xy+4y^2)-(x^2-y^2)-5y^2]/(2x)=[4xy]/(2x)=2y[(3x

1、原式=[2x/(x^2-1)]-[(x+1)/(x^2-1)]=[2x-(x+1)]/(x^2-1)=(x-1)/(x^2-1)=(x-1)/[(x+1)(x-1)]=1/(x+1)2、原式=[x

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

x²/3-4y²/27=1令x²/3-4y²/27=0则x²/3=4y²/27y²=9x²/4y=±3x/2所以双曲线x

y²/(27/4)-x²/3=1a²=27/4b²=3所以y=±(b/a)x即y=±2√3x/3

x^2*y+y=x^2-1x^2(y-1)=-y-1x^2=(y+1)/(1-y)>=0(y+1)/(y-1)

x^2/25+y^2/16=1是个椭圆方程由椭圆的定义椭圆上一点到两个焦点距离之和=2a=2*5=10

1.x^2/16+y^2/12=1a=4,c=2离心率c/a=1/2.焦点坐标(-2,0),(2,0)顶点:(-4,0)(4,0)(0,2√3)(0,-2√3)2.x^2/6+y^2/10=1c=2离

(x-y)的平方除以(x-y)的6次方=1/(x-y)的4次方

x平方+y平方+2xy分之x平方-4y平方除以x平方+xy分之2y+x=(x-2y)(x+2y)/(x+y)²·x(x+y)/(x+2y)=x(x-2y)/(x+y)

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&#

[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

(x²+xy)/(x+y)²=x(x+y)/(x+y)²=x/(x+y)2xy/(x+y)²x/(x²-y²)∵最简公分母为：(x+y)&#

椭圆X平方除以4+Y平方除以2=1用三角换元x=2cosay=根号2sinaY除以（X-4）=根号2sina除以（2cosa-4）下面看这一部分2sina除以（2cosa-4）=（2sina-0）除以

X=20/3y=4或者x=-265/39,y=-53/13