怎么将x^4 - (x1+x2)x^3 + (x1*x2-2)x^2 - (x1+x2)x +1因式分解?分解成(x^2
来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/16 19:24:08
怎么将x^4 - (x1+x2)x^3 + (x1*x2-2)x^2 - (x1+x2)x +1因式分解?分解成(x^2 - x1*x - 1)* (x^2 - x2 -1)
x^4 - (x1+x2)x^3 + (x1*x2 - 2)x^2 + (x1 + x2)x +1
= x^4 - x1*x^3 - x2*x^3 + x1*x2*x^2
- 2x^2 + x1x + x2x + 1
= (x^4 - x2*x^3 - x^2)
+ (- x1*x^3+ x1*x2x^2 + x1*x)
+ (- x^2 + x2*x + 1)
= x^2(x^2 - x2*x - 1)
- x1*x(x^2 - x2*x - 1)
-(x^2 - x2*x - 1)
=(x^2 - x1*x - 1)* (x^2 - x2*x -1) .
(PS:不好意思,把原题改了一个符号)
= x^4 - x1*x^3 - x2*x^3 + x1*x2*x^2
- 2x^2 + x1x + x2x + 1
= (x^4 - x2*x^3 - x^2)
+ (- x1*x^3+ x1*x2x^2 + x1*x)
+ (- x^2 + x2*x + 1)
= x^2(x^2 - x2*x - 1)
- x1*x(x^2 - x2*x - 1)
-(x^2 - x2*x - 1)
=(x^2 - x1*x - 1)* (x^2 - x2*x -1) .
(PS:不好意思,把原题改了一个符号)
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