x^3-5x^2+5x+5=0
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x^3-5x^2+5x+5=0x^3-5x^2+5x+5=0x^3-5x^2+5x+5=0x^3-5x^25x5=0这是个一元三次方程,用盛金公式得三个根:x1=(5-(100^(1/3)10^(1/
x^3-5x^2+5x+5=0
x^3-5x^2+5x+5=0
x^3-5x^2+5x+5=0
x^3-5x^2 5x 5=0
这是个一元三次方程,用盛金公式得三个根:
x1=(5-(100^(1/3) 10^(1/3))/3
x2=(5 sin30°[100^(1/3) 10^(1/3)] cos30°[100^(1/3)-10^(1/3)]i)/3
x3=(5 sin30°[100^(1/3) 10^(1/3)]-cos30°[100^(1/3)-10^(1/3)]i)/3
∴ x³-5x² 5x 5
X^3-5X^2 5X 5
=X(X^2-5X 5) 5
=X[(X^2-3X-1) (-2X 6)] 5
=X(X^2-3X-1) X(-2X 6) 5
=X(X^2-3X-1)-2(X^2-3X-1) 3.
=(x-2)(x^2-3x-1) 3=0
∴x1=1,
【注:若一个多项式各...
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∴ x³-5x² 5x 5
X^3-5X^2 5X 5
=X(X^2-5X 5) 5
=X[(X^2-3X-1) (-2X 6)] 5
=X(X^2-3X-1) X(-2X 6) 5
=X(X^2-3X-1)-2(X^2-3X-1) 3.
=(x-2)(x^2-3x-1) 3=0
∴x1=1,
【注:若一个多项式各项系数和为0,则该多项式必然含有因式x-1
若一个多项式奇数项系数之和等于偶数项系数,则该多项式必然含有因式x 1】
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