已知p=2x²+4y+23,Q=x²-y²+6x
已知P=x²/x-y-y²/x-y,Q=(x+y)²-2y(x+y),小红、小华两人在x=
数学题已知p=x^/x-y-y^/x-y,q=(x+y)^-2Y(X+Y),
已知集合P={(x,y)|{3x-4y+3≥0,4x+3y-6≤0,y≥0}},Q={(x,y)|(x-a)²
已知p=(x²)/(x-y)-(y²)/(x-y)Q=(x+y)²-2y(x+y)小敏 小
已知集合P={y|y=3x-1,x>1},Q={y|y=-2x²+10,x∈R},则P∩Q=
圆x²+y²+4x-4y-1=0与圆x²+y²+2x-13=0相交于P,Q两点.
设集合P={x-y,x+y,xy},Q={x²十y²,x²-y²,0},若P=Q
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
1.已知P={(x,y)|y=-x²+2},Q={(x,y)|y=-x+2},求P∩Q
设P={y[y=-x²+1,x∈R}.Q={y[y=2^x,x∈R},则( )
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
已知x²+y²+13-4x+6y=0,求(2x-y)²-2(2x-y)(x+2y)+(x+