因式分解 x四次方-2x³-9x²+2x+8含有因式x²-5x+4,
人气：147 ℃ 时间：2019-10-24 02:00:26
解答
x⁴- 2x³ - 9x² + 2x + 8= x⁴- x³ - x³ + x² - 10x² + 10x - 8x + 8= x³(x-1) - x²(x-1) - 10x(x-1) - 8(x-1)= (x-1)(x³ - x² - 10x - 8)= (x-1)(x&#...
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