若|x|-|y|=0则( ) A.x=0 B.y=0 C.x=y=0
如果分式3x-6y/x+y=0,那么x,y 应满足 A、x=2y B、x≠-y C、x=2y且x≠-y D、x=2y且y
已知x、y、z均为实数,若X+Y+Z≠0,a=X/X+Y,b=Y/Z+X,c=Z/X+Y,求a/a+1,b/b+1,c/
集合A={(X,Y)|2X-Y=0}B={(X,Y)|3X+Y=0}C=={(X,Y)|2X-Y=3}求A交B,A交C,
以下不正确的语句为____ A) if(x>y); B) if(x=y)&&(x!=0) x+=y; C) if(x!y
已知集合A={(x,y)|2x-y=0},B={(x,y)|3x+y=0},C={(x,y)|2x-y=3}求A∩B,A
已知集合A={(x,y)|2x-y=0},B={(x,y)|3x+y=0},C={(x,y)|2x-y=3},求A交B,
已知集合A={(x,y)|2x-y=0},B={(x,y)|3x+y=0},C={(x,y)|2x-y=3},求A与B的
已知集合A={(x,y)/2x—y=0},B={(x,y)/3x+y=0 }.C={(x,Y)/2x-y=3},求A∩B
已知集合A={(x,y|2x-y=0)},B={(x,y)|3x+y=0},C={(x,y)|2x-y=3},求A∩B,
已知x,y是实数,向量a,b不共线,若(x+y-1)a+(x-y)b=0,则x=?y=?
已知实数x,y ,向量a,b不共线若(x+y-1)a+(x-y)b=0则x= y=
已知x,y∈R,向量a,b不共线,若(x+y-2)a+(x-y)b=0,则x=,y=?