已知x2+x+3=0,求x5+3x4+2x3+2x2-10x的值.
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解决时间 2021-01-22 10:03
- 提问者网友:浪荡绅士
- 2021-01-21 15:10
已知x2+x+3=0,求x5+3x4+2x3+2x2-10x的值.
最佳答案
- 五星知识达人网友:患得患失的劫
- 2020-09-06 17:45
解:∵x2+x+3=0,
∴x2+x=-3,
x5+3x4+2x3+2x2-10x
=x3(x2+x)+2x4+2x3+2x2-10x
=-3x3+2x4+2x3+2x2-10x
=2x4-x3+2x2-10x
=2x2(x2+x)-3x3+2x2-10x
=-3x3-4x2-10x
=-3x(x2+x)-x2-10x
=9x-x2-10x
=-x2-x
=-(x2+x)
=3.解析分析:要先提公因式,再根据x2+x+3=0得出x2+x=-3分别一步步代入,即可求出
∴x2+x=-3,
x5+3x4+2x3+2x2-10x
=x3(x2+x)+2x4+2x3+2x2-10x
=-3x3+2x4+2x3+2x2-10x
=2x4-x3+2x2-10x
=2x2(x2+x)-3x3+2x2-10x
=-3x3-4x2-10x
=-3x(x2+x)-x2-10x
=9x-x2-10x
=-x2-x
=-(x2+x)
=3.解析分析:要先提公因式,再根据x2+x+3=0得出x2+x=-3分别一步步代入,即可求出
全部回答
- 1楼网友:你可爱的野爹
- 2020-12-30 12:38
谢谢了
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