已知x,y∈R,满足x²+y²-4x-6y+12=0 1.y/x的范围,2.x²+y²的范围 3已知x,y∈R,满足x²+y²-4x-6y+12=01.y/x的范围,2.x²+y²的范围 3.x+y的范围
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已知x,y∈R,满足x²+y²-4x-6y+12=01.y/x的范围,2.x²+y²的范围3已知x,y∈R,满足x²+y²-4x-6y+12
已知x,y∈R,满足x²+y²-4x-6y+12=0 1.y/x的范围,2.x²+y²的范围 3已知x,y∈R,满足x²+y²-4x-6y+12=01.y/x的范围,2.x²+y²的范围 3.x+y的范围
已知x,y∈R,满足x²+y²-4x-6y+12=0 1.y/x的范围,2.x²+y²的范围 3
已知x,y∈R,满足x²+y²-4x-6y+12=0
1.y/x的范围,2.x²+y²的范围 3.x+y的范围
已知x,y∈R,满足x²+y²-4x-6y+12=0 1.y/x的范围,2.x²+y²的范围 3已知x,y∈R,满足x²+y²-4x-6y+12=01.y/x的范围,2.x²+y²的范围 3.x+y的范围
