Question

若2x-kx+3被2x+1除后余2,则k的值为多少

Answer 1

设2x-kx+3=(2x+1)(ax+b)+2 (2x+1)(ax+b)+2=2ax^2+(a+2b)x+b+2 比较系数 a=1 b+2=3 b=1 -k=a+2b=3 k=-3