> 数学 >
若3x^3-x=1,求9x^4+12x^3-3x^2-7x+2003的值,
人气:439 ℃ 时间:2020-01-30 11:38:25
解答
9x^4+12x^3-3x^2-7x+2003
=9x^4-3x^2+12x^3-7x+2003
=3x(3x^3-x)+12x^3-7x+2003
=3x+12x^3-7x+2003
=12x^3-4x+2003
=4(3x^3-x)+2003
=2007
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版