设2x^3-kx^2+3=(2x+1)(x^2+mx+1)+2
2x^3-kx^2+3=2x^3+2mx^2+2x+x^2+mx+1+2
2x^3-kx^2+3=2x^3+(2m+1)x^2+(2+m)x+3
得2m+1=-k
2+m=0
所以m=-2
k=3
诺多项式x^3-kx^2+3被2x+1除后余2,求k的值
设2x^3-kx^2+3=(2x+1)(x^2+mx+1)+2
2x^3-kx^2+3=2x^3+2mx^2+2x+x^2+mx+1+2
2x^3-kx^2+3=2x^3+(2m+1)x^2+(2+m)x+3
得2m+1=-k
2+m=0
所以m=-2
k=3