y=x²+2x-3 x∈[1,2]
函数,y=3x/(x^2+x+1) ,x
函数y=3x/(x^2+x+1) (x
y=(x²+2x+3)/x+1,x∈[0,1]的值域
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
若全集I={(x,y)|x,y∈R},集合M={(x,y)|(y-3)/(x-2)},N{(x,y)|y=x=1},则(
1、x(x-y)(x+y)-x(x+y)^2
y=(x^2+x)/(x+1)
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
y=(2x*x-2x+3)/(x*x-x+1),求值域?
已知集合A={(x,y)| (y-3)/ (x-1)=2,x,y∈R},B={(x,y)| 4x+ay=16,x,y∈
(X-Y)²+(3X-2Y)(2X+Y)-X(6X-Y),其中X=½,Y=1(先化简再求值)