—Miss Gao has ____________ free time than Mr Green.—I think so. She is busy every day.
A:much
B:less
C:more
D:fewer
关于x的方程ax2+bx+c=3的解与(x﹣1)(x﹣4)=0的解相同,则a+b+c的值为( )
三角形两边长分别为3和6,第三边是方程x 2-6x+8=0的解,则这个三角形周长是( )