【单选题】若2 x -3 -x ≥2 -y -3 y ,则( )
【单选题】已知A={x|y=x,x∈R},B={y|y=x 2 ,x∈R},则A∩B等于 [ ]
【单选题】--Fine, thanks. __________ --Very well, thanks.
【单选题】—____ are you? Very well, thanks. [ ]
【单选题】— ______ are your parents? — They’re very well. Thanks.
【单选题】已知集合A={(x,y)|x+y=0,x,y∈R};B=[(x,y)|x-y=0,x,y∈R],则集合A∩B=( )
【单选题】_____________ are you? Very well, thanks. [ ]
【简答题】若|x+y|=y-x,则有( ) A.y>0,x<0 B.y<0,x>0 C.y<0,x<0 D.x=0,y≥0或y=0,x≤0
【单选题】若3 x -5 -x ≥3 -y -5 y ,则( )