x的4次方加5x的3次方减2x的2次方减5x加1

2024-12-27 22:58:54
推荐回答(1个)
回答1:

x⁴+5x³-2x²-5x+1
=(x⁴-x²)+(5x³-5x)-(x²-1)
=x²(x²-1)+5x(x²-1)-(x²-1)
=(x²-1)(x²+5x-1)
=(x+1)(x-1)(x²+5x-1) 没学过根式的话就到这里,学过的话,继续:
=(x+1)(x-1)[(x+ 5/2)² -29/4]
=(x+1)(x-1)[x+(5+√29)/2][x+(5-√29)/2]