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

Toán Lớp 8: Giúp mk vs ạ,hứa cho ctlhn e)x⁷+x⁵+1 g)x⁸+x⁴+1

Toán Lớp 8: Giúp mk vs ạ,hứa cho ctlhn
e)x⁷+x⁵+1
g)x⁸+x⁴+1

Comments ( 2 )

  1. Xin gửi chủ tus ạ
    Cho mk xin ctlhn nha
    toan-lop-8-giup-mk-vs-a-hua-cho-ctlhn-e-1-g-1

  2. e) x^7 + x^5 + 1
    = x^7 – x^4.x^2 + x^5 – x.x² + x² + x^6 – x^5 + x^4 – x^2 + x + x^5 – x^4 + x³ -x + 1
    = x²(x^5 – x^4 + x³ – x + 1) + x(x^5 – x^4 + x³ – x + 1) + (x^5 – x^4 + x³ – x + 1)
    = (x² + x + 1)(x^5 – x^4 + x³ – x + 1)
    f) x^8 + x^4 + 1
    =x^8-x^5+x^5-x^2+x^4-x+x^2+x+1
    =x^5(x^3-1)+x^2(x^3-1)+x(x^3-1)+x^2+x+1
    =x^5(x-1)(x^2+x+1)+x^2(x-1)(x^2+x+1)+x(x-1)(x^2+x+1)+x^2+x+1
    =(x^2+x+1)(x^6-x^5+x^3-x^2+x^2-x+1)
    =(x^2+x+1)(x^6-x^5+x^3-x+1)

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