急…(1)x^3-2x^2-5x+10(2)求方程x^2-3│x│-2=0最小一个根的负倒数(3)（x+1)(x+2)(x+3)(x+4)=120(4)已知x^4-5x^3+8x^2-5x+1=0,求x+1/x的值(5)解方程√（3x-2）+√（x+3)=3

Question

急…
(1)x^3-2x^2-5x+10
(2)求方程x^2-3│x│-2=0最小一个根的负倒数
(3)（x+1)(x+2)(x+3)(x+4)=120
(4)已知x^4-5x^3+8x^2-5x+1=0,求x+1/x的值
(5)解方程√（3x-2）+√（x+3)=3

Answer 1

(1)x^3-2x^2-5x+10 =x^2(x-2)-x(x-2)=(x-2)(x^2-x)=x(x-2)(x-1)(3)（x+1)(x+2)(x+3)(x+4)=120（x+1)(x+2)(x+3)(x+4)=2*3*4*5x+1=2 x+2=3 x+3=4x+4=5得：x=1(5)解方程√（3x-2）+√（x+3)=3 （3x-2)+(x+3)+2√(3x-2)(...