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

Toán Lớp 8: a) x² – 4x +3 b) x² + 5x +4 c)x² – x – 6 d)x⁴+4 Giúp mik vs ạ

Toán Lớp 8: a) x² – 4x +3
b) x² + 5x +4
c)x² – x – 6
d)x⁴+4
Giúp mik vs ạ

Comments ( 2 )

  1. a) x^2 – 4x + 3
    = x^2 – 3x – x + 3
    = x(x-3) – (x-3)
    = (x-1)(x-3)
    b) x^2 + 5x + 4
    = x^2 + x + 4x +4
    = x(x+1) + 4(x+1)
    = (x+4)(x+1)
    c) x^2 – x – 6
    = x^2 +2x – 3x – 6
    = x(x+2) – 3(x+2)
    = (x-3)(x+2)
    d) x^4 + 4
    = x^4 + 4x^4 + 4 – 4x^4
    = (x^2)^2 + 2.x^2.2 + 2^2 – (2x)^2
    = (x^2+2)^2 – (2x)^2
    = (x^2-2x+2)(x^2+2x+2)

  2. Đáp án:
     
    Giải thích các bước giải:
     

    toan-lop-8-a-4-3-b-5-4-c-6-d-4-giup-mik-vs-a

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