x的三次方减11x加20因式分解
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解决时间 2021-05-05 09:37
- 提问者网友:战皆罪
- 2021-05-05 03:36
x的三次方减11x加20因式分解
最佳答案
- 五星知识达人网友:孤老序
- 2021-05-05 04:38
x的三次方减11x加20
=x³-11x+20
=x³+4x²-4x²-16x+5x+20
=(x³+4x²)-(4x²+16x)+(5x+20)
=x²(x+4)-4x(x+4)+5(x+4)
=(x+4)(x²-4x+5)
=x³-11x+20
=x³+4x²-4x²-16x+5x+20
=(x³+4x²)-(4x²+16x)+(5x+20)
=x²(x+4)-4x(x+4)+5(x+4)
=(x+4)(x²-4x+5)
全部回答
- 1楼网友:山有枢
- 2021-05-05 04:53
-x3+15x2-48x+44
=-x3+2x2+13x2-26x-22x+44
=-x2(x-2)+13x(x-2)-22(x-2)
=-(x-2)(x2-13x+22)
=-(x-2)(x-2)(x-11)
=-(x-2)2(x-11)
=-x3+2x2+13x2-26x-22x+44
=-x2(x-2)+13x(x-2)-22(x-2)
=-(x-2)(x2-13x+22)
=-(x-2)(x-2)(x-11)
=-(x-2)2(x-11)
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