若4x²+9y²-12x+6y+10=0,则x+y=A.1/6 B.7/6 C.11/6 D.5/6

问题描述:

若4x²+9y²-12x+6y+10=0,则x+y=
A.1/6 B.7/6 C.11/6 D.5/6