已知3x2-x=1,求6x3十7x2-5x十2000的值

2024-11-19 21:29:28
推荐回答(1个)
回答1:

3x^2-x=1
∴6x^3+7x^2-5x+2000
=(6x^3-2x^2)+9x^2-5x+2000
=2x(3x^2-x)+9x^2-5x+2000
=2x+9x^2-5x+2000
=9x^2-3x+2000
=3(x^2-x)+2000
=3+2000
=2003