單項(xiàng)選擇題曲線x3+y3-xy=7上點(diǎn)(1,2)處的切線方程是()
A.x-11y+21=0
B.11x-y-9=0
C.x+11y-23=0
D.11x+y-13=0
A.x-11y+21=0
B.11x-y-9=0
C.x+11y-23=0
D.11x+y-13=0