求y=x^2sin1 x在x=0处导数
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(2x+y)/(x^2-2xy+y^2)X(x-y)=(2x+y)/(x-y)²*(x-y)=(2x+y)/(x-y)x-3y=0,x=3y(2x+y)/(x-y)=(6y+y)/(3y-y
不知道楼主听没听说过“圆族”给定两圆方程,过两圆交点的所有圆可以表示成很简单的形式拿上题来说,过以上两圆的两个交点的所有圆的方程可表示成(x²+y²+10y-24)+k*(x&su
x²+4x+y²+6y+13=x²+4x+4+y²+6y+9=(x+2)²+(y+3)²=0所以x+2=0;y+3=0所以x=-2,y=-3
lny=xln(2+x)dlny=dxln(2+x)dy/y=ln(2-x)dx+x*1/(2+x)dxdy/(2+x)^x=[ln(2-x)+x/(2+x)]dxdy=(2+x)^x[ln(2-x)
X/X···这是什么意思···再问:x减y分之x等于x分之x减2y再答:两边同乘x(x-2y)再问:再答:题目是什么····就给个图啊···再问:如图,已知EFGH为矩形,AD⊥Bc于D,交HG于K,
(x*x+y*y)(x*x+y*y)-4x*x*y*y=(x^4-2x^2y^2+y^4)=(x^2-y^2)^2=0x^2=y^2x/y=±1(x*x+5xy+y*y)/(x*x+2xy+y*y)=
∵x²+y²-4x+2y+5=0x²-4x+4+y²+2y+1=0(x-2)²+(y+1)²=0x-2=0y+1=0∴x=2y=-14x
x+y=m2x-y=6x=(m+6)/3y=(2m-6)/3x+y=m>0x-y=(12-m)/3>00
X+Y分之X-Y等于3x=-2yX+Y分之2(x-y)减X+Y分之3X+Y=(-x-3y)/(x+y)=1
最大值为1,可以用基本不等式,等式上下同时除以x,那么y=2x/x平方+1化为:y=2/(x+1/x),分母x+1/x≥2,所以y≤1.2.或者利用x平方+1≥2x,所以y≤1.3.求导也行.4.化为
因为(x-y)/(x+y)=3,则(x+y)/(x-y)=1/3则5(x-y)(x+y)-(x+y)/2(x-y)=5*3-1/(3*2)=15-1/6=89/6
3x^2+xy-2y^2=0推出(3x-2y)(x+y)=0推出x=-y或x=(2/3)y{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}/x^2-9y^2推出:{
即(x-2y)²=0x-2y=0所以x=2y所以原式=(2x²+2xy-xy-y²)/(4x²-4xy+y²)=(2x²+xy-y²
x²+y²-2x+10y-24=0.(1)x²+y²+2x+2y-8=0.(2)(2)-(1):4x-8y+16=0x=2y-4x²+y²+
x+y=1x-y=2(x+2y)(x-2y)-(2x-y)(-y-2x)=(x+2y)(x-2y)+(2x-y)(y+2x)=x²-4y²+4x²-y²=5x&
已知x^2+4y^2-4x+4y+5=0求((y^4-x^4)/(y-2x)(x+y))*((2x-y)/(xy-y^2))/((x^2+y^2)/y)的值答案:x²+4y²-4x
如果是(x-y)/x=x/x-2y,则x:y=2:3(x-y)/x=(x-2y+2y)/x-2y1-y/x=1+2y/(x-2y)-y/x=2y/(x-2y)x/y=(x-2y)/-2yx/y=-1/
如果是求导数的话,y'=(2x+e^x)/(x^2+e^x)
y=2x/(x^2+1)=2/(x+1/x)=2当x=1/x时取得,即x=1