已知x的平方-5x+1=0,求x的三次方-4x的平方-1的值?

2024-12-26 00:13:53
推荐回答(1个)
回答1:

x的平方-5x+1=0,
x²=5x-1

x的三次方-4x的平方-1
=x(5x-1)-4x²-1
=5x²-5x-4x²-1
=x²-5x-1
=5x-1-5x-1
=-2