y={2,X≥0.-1,X
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y={2,X≥0.-1,X
y={2,X≥0.-1,X<0},求函数y=|X|图像
y={2,X≥0.-1,X
设变量x y满足约束条件x-y≥-1 x+y≥1 2x-y≤1 z=(x-2y)/(x+y)的最大值
y={2,X≥0.-1,X
y={2,X≥0.-1,X
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
已知变量X,Y 满足{X≥1,Y≤2,X-Y≤0.则Z=X+Y 的最小值为 ( )求图像!X≥1,Y≤2,X-Y≤0 求图像.
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)(x+y)-(x+y)^2+2y(y-x),其中x=1,y=3.
2y(x+二分之一y)-[(x+y)(x-y)+2y(y+x)],其中|x-1|=2
求y=(x^2)+2x(x≥0) y=-x+2x(x
x+2y=2x+y+1=7x-y 求:2x-y?
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
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
y=(2x)/x-1化简成用y表示x
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