已知关于x的方程x2-kx-3=0的一个根为3,则k的值为( )
A:1
B:-1
C:2
D:-2
下列说法正确的有( )
(1)若ac=bc,则a=b;
(2)若ac=b-c,则a=﹣b;
(3)若x2=y2,则﹣4ax2=﹣4by2;
(4)若方程2x+5a=11﹣x与6x+3a=22的解相同,则a的值为0.
Dear Alan,
I'm looking forward to staying in the countryside with you for one week this summer vacation.
Yours truly
Li Hua