作业帮3x^2+2y^2=6x,判断x^2+y^2取值范围．3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q
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3x^2+2y^2=6x,判断x^2+y^2取值范围．3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q
3x^2+2y^2=6x,判断x^2+y^2取值范围．
3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q
3x^2+2y^2=6x,判断x^2+y^2取值范围．3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q3Q
这个应该是高3的问题
用圆锥曲线来做
3x^2+2y^2=6x可化为(x-1)^2+2(y^2)/3=1
所得一椭圆 恰巧过原点 又因为 椭圆右端点距离原点最远
所以 x^2+y^2取值范围 为 [0,4]
你是几年级的？我可没有学过．
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
（x+y）/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
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)-2(x+y)=14 3(x-y)+(x+y)=5
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
判断单调性 y=sin(x-π/6) y=sin(-2x+π/3)
x(x-y)2-(y-x)3
因式分解3x^2(x-y)+6x(y-x)
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一