y=(x^2-3x)/(x+1)
来源:百度知道 编辑:UC知道 时间:2024/05/27 00:59:11
y=(x^2-3x)/(x+1)
(x-1)>0
求最小值
(x-1)>0
求最小值
-1
求导数,另它等于0,解的X的值,算出Y来就行了
(x-1)>0是 (x-1)≥0?或者是x+1>0?否则没有最小值。
y=(x^2-3x)/(x+1)
=x-4+4/(x+1)
=(x+1)+4/(x+1)-5
≥2√[(x+1)*4/(x+1)]-5
=-1,
当x+1=4/(x+1)时,即x=1时,等号成立,
y=(x^2-3x)/(x+1)的最小值为-1.
^什么意思?
若3x-2y=0,求(x+y)/(x-y)+(x-y)/(x+y)的值
3(x+y)(x-y)+4(x-y)^2=?
已知(x-y)/(x=y)=2,求(x-y)/(2x+2y)-(2x+2y)/(3x-3y)的值
若 x/3y = y/2x-5y =6x-15y/x
x^2-3y^2=2xy, x+2y/x-y=?
(x+y)/3=(x-y)/4 2x+3y=11
已知:X*X+Y*Y=34,X-Y=2,则X/Y=
3(x+y)-2(x-y)=9 5(x+y)+2(x-y)=-1
z=根号((x*x+y*y-x)/(2*x-x*x-y*y)) 求它的定义域
x^2+√(2)y=√3, y^2+√(2)x=√3,x≠y,x/y+y/x=?????