A={(x,y)‖x+2｜+√y+1=0},B={-2,-1}则必有:A.A⊇B B.A⊆B C.A=B D.A∩B=Ф

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 A={(x,y)|y=-x^2+mx-1},B={(x,y)|y=3-x,0A={(x,y)|y=-x^2+mx-1},B={(x,y)|y=3-x,0 已知集合A={(x,y)|2x-y+2>=0,x-2y+1 方程组{ X+Y=1 X-Y=2a }的解满足 {x>0 y 集合A={（x,y)|y=-x^2+mx-1},B={(x,y)|y=3-x,0 已知x属于R,y>0,集合A={x|x*x+x+1,-x,-x-1},集合B={-y,-y/2,y+1}若A=B,则x*x+y*y的值为 设平面点集A={(x,y)|(y-x)(y-1/x)>=0},B={(x,y)|(x-1)^2+(y-1)^2 设平面点集A={(x,y)|(y-x)(y-1/x)>=0},B={(x,y)|(x-1)^2+(y-1)^2 设平面点集A={(x,y)|(y-x)(y-1/x)>=0},B={(x,y)|(x-1)^2+(y-1)^2 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 基本函数的导函数.念法.1.y=c(c为常数) y'=0 2.y=x^n y'=nx^(n-1) 3.y=a^x y'=a^xlna y=e^x y'=e^x 4.y=logax y'=logae/x y=lnx y'=1/x 5.y=sinx y'=cosx 6.y=cosx y'=-sinx 7.y=tanx y'=1/cos^2x 8.y=cotx y'=-1/sin^2x 9.y=arcsinx y'=1/√1-x^2 10.y=a 设x大于1,y大于0,x^y+x^-y=2根号二,x^y-x^-y等于? A={(X,Y)|X+Y>=1},B={(X,y)|X^2+y^2=1},B={(X,y)|X^2+y^2 假设集合U={(x,y)|x∈R,y∈R },A={(x,y)|2x-y+m>0},B={(x,y)|x+y-n |2x+y+1|+√2y+3x=0则x.y= y=ln(x-√x^2+a^2)-arcsin（a/x） 求y' y=ln(x+√1+x^2) 求y‘ A={y|y=(x-1)^2,x≤0},B={y|y=x^2-x+1,x∈R},A与B关系 先化简 再求值 (2x-y)(y+x)-(x-2y)(2y+x)-(-3y+x)^2其(√x+1)+y^2+4=-4y