y=2x-1/x^2+2x+2和y=x-2/x^2-3x+2的值域
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/16 18:26:03
x=N0Җc9v\PĹ "h.B⧠"KT9MVrHAT[ę͌\53r)b2_\KͭoGVh釱
6χe"EP#,+;p%(y&+Ҷ>8~%vI4
H=KNn|6B:|@lAhɾ}Zl>'줂,҈M6S$Y*HYR
y=2x-1/x^2+2x+2和y=x-2/x^2-3x+2的值域
y=2x-1/x^2+2x+2和y=x-2/x^2-3x+2的值域
y=2x-1/x^2+2x+2和y=x-2/x^2-3x+2的值域
y=(2x-1)/(x^2+2x+2)
分母x^2+2x+2=(x+1)^2+1>0
y(x^2+2x+2)= 2x-1
yx^2+2yx+2y= 2x-1
yx^2+2(y-1)x+(2y+1)= 0
判别式△=4(y-1)^2-4y(2y+1)=4y^2-8y+4-8y^2-4y=-4y^2-12y+4≥0
y^2+3y-1≤0
(-3-√13)/2≤y≤(-3+√13)/2
值域【(-3-√13)/2,(-3+√13)/2】
y=(x-2)/(x^2-3x+2)
= (x-2)/[(x-1)(x-2)]
= 1/(x-1)
1/(x-1)≠0
值域(-∞,0),(0,+∞)
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
(x-2y)(x+y)-2x(-2x-3y)+6x(-x-y),其中x=-1,y=2要讲解和答题
已知x+y=a,2x-y=-2a,求[(x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
2y(x+二分之一y)-[(x+y)(x-y)+2y(y+x)],其中|x-1|=2
(x-y)(x+y)-(x+y)^2+2y(y-x),其中x=1,y=3.
x+2y=2x+y+1=7x-y 求:2x-y?
方程组2x-(x+y)=-1和x+4(x+y)=22
二元一次方程 :2(x+y)-(x-y)=3 (x+y)-2(x-y)=1
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
方程x(x*x+y*y-1)=0和x*x-(x*x+y*y-1)^2=0表示的图形是?
y=(2x)/x-1化简成用y表示x
设x,y满足约束条件x+y>=1,x-y>=-1,2x-y
设x,y满足约束条件x+y>=1,x-y>=-1,2x-y
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1