y=x^3-x 当x=2时 △x=0.01 dy=
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当x=根号3时函数y=2-x/x-3的值是=(2-√3)/(√3-3)=(2-√3)(3+√3)/(3-9)=(6+2√3-3√3-3)/(-6)=-1/2+√3/2;2.已知函数f(x)=根号(2x
y>=-3或者y
x+y/x-y=1/2取倒数x-y/x+y=2所以x-y/x+y-2x+2y/x-y=x-y/x+y-2(x+y/x-y)=2-2×1/2=2-1=1
原式=1/2×2x-y/x+y+2x-y/6x-3y=1/2+1/3=5/6
(2x-y)/(x+y)=3所以(x+y)/(2x-y)=1/3原式=1/2*(2x-y)/(x+y)+1/3*(x+y)/(2x-y)=3/2+1/9=29/18
因为X+2/X-Y=2所以X=2Y+2将X=2Y+2代入X+Y/3(X-Y)-(X-Y)/2(X+Y)=(3Y+2)/3(2Y+2-Y)-(2Y+2-Y)/2(3Y+2)接下来自己算
原试=-y-y-y.-y大概有50个-y所以答案是-50/3
当x=y时2x+3y=2x+3x=45x=4x=4/5
当x为+∞或者无限接近于0的左边的,y为无穷大当x为无限接近于0的右边时或者x为无穷小时
当x0所以f(-x)=x'2+2x+3,因为f(x)是奇函数,所以f(x)=-f(-x)=-x'2-2x-3即当x
2x-y\x+y=32x-y=3(x+y)2x-y=3x+3y3x-2x=-y-3yx=-4y2x-y/2x+2y+x+y/6x-3y=(-8y-y)/(-8y+2y)+(-4y+y)/(-24y-3
1.(x+y)/(x-2y)=3x+y=3x-6y2x=7y2x/y=7y/y=72.16的(2-x)次方=8的(x+5)次方【16=2的4次方,8=2的3次方】2的4(2-x)次方=2的3(x+5)
=(x-(x+y))+((x+2y)-(x+3y))+...+((x+98y)-(x+99y))=-y*50=2*50=100
y>=x>=0x+3y的最大值为12所以y小于等于4大于等于3,所以2x+y小于等于9大于等于4.所以k小于等于-4大于等于-9
y=-4x²+6x-b/2a=-6/2*(-4)=3/4=xy=-4*9/16+6*3/4=-9/4+18/4=9/4当x=3/4时,函数y=2x(3-2x),(0
-x=3x²-2x-53x²-x-5=0x²-x/3+1/36=61/36(x-1/6)²=61/36x=1/6+√61/6x=1/6-√61/6
原式=(x-y)/x/((x^2-2xy+y^2)/x)=(x-y)/x乘以(x/(x^2-2xy+y^2))=(x-y)/x乘以(x/(x-y)^2)=1/(x-y)当x=2008,y=2009原式
(x+y)(x-y)+(x-y)²-(x²-3xy)=x²-y²+x²-2xy+y²-x²+3xy=x²+xy=x(x+
y=2x+8/x²-3(x>0),=x+x+8/x²-3∵x>0根据均值定理∴x+x+8/x≥3³√(x*x*8/x²)=6当且仅当x=8/x²,x=
Y的取值范围:(0,1)