— Are these books ______ ?
— No, they are not mine. They belong to _____.
A:your; her
B: yours; her
C:you; hers
D: yours; she
一元二次方程 3x2−3x=x+2 化为一般形式 ax2+bx+c=0 后, a,b,c 的值分别是( )