华润股票行情:十万火急

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(1) x^3 + 2x^2 - 5x - 6
(2)x^5 + x -1
(3) x^5 + x^4 +1
要快

1. x^3+2x^2-5x-6=(x-2)(x+1)(x+3)
2. x^5+x-1=(x^3+x^2-1)(x^2-x+1)
3. x^5+x^4+1=(x^3-x+1)(x^2+x+1)

(1)
x^3 + 2x^2 - 5x - 6
= (x - 2)(x^2 + 4x + 3)
= (x - 2)(x + 1)(x + 3)

(2)
x^5 + x -1

当 x = 0 时,式子为 -1,x = 1时为 +1,所以有a大于0小于1的因子(x - a)....没有找到a的数值

(3)
x^5 + x^4 + 1

(1)
x^3 + 2x^2 - 5x - 6
= (x - 2)(x^2 + 4x + 3)
= (x - 2)(x + 1)(x + 3)

(2)
x^5 + x -1

当 x = 0 时,式子为 -1,x = 1时为 +1,所以有a大于0小于1的因子(x - a)....没有找到a的数值

(3)
x^5 + x^4 + 1