2x^3-6x^2-3x+9=0 X^3-3x-2=0 X^4-3x^2+2x^2-6x=0 X^5-6x^3+9x=0解方程,
问题描述:
2x^3-6x^2-3x+9=0 X^3-3x-2=0 X^4-3x^2+2x^2-6x=0 X^5-6x^3+9x=0解方程,
答
(1)2x^3-6x^2-3x+9=0 2x^2(x-3)-3(x-3)=0(2x^2-3)(x-3)解得:x1=3/2,x2=根号6/2,x3=-根号6/2(2) X^3-3x-2=0x^3-2x^2+2x^2-3x-2=0x^2(x-2)+2x^2-4x+x-2(x-2)(x^2+2x+1)=0(x-2)(x+1)^2=0解得:x1=2,x2=X3=-1(3...