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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: tìm x: a) x^3+2x^2+x-2=0 b) x^3-5x^2-x+5=0

Toán Lớp 8: tìm x:
a) x^3+2x^2+x-2=0
b) x^3-5x^2-x+5=0

Comments ( 1 )

  1. a):
    x^3+2x^2+x-2=0
    ↔ Sử dụng phương trình bậc ba
    → x = 0,695621
    b):
    x^3-5x^2-x+5=0
    ⇒ x^2(x−5)−(x−5)=0
    ⇒ (x−5)(x^2−1)=0
    → \(\left[ \begin{array}{l}x=5\\x=1\\x=-1\end{array} \right.\) 
     

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222-9+11+12:2*14+14 = ? ( )