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

Toán Lớp 8: (X+1).(x^6-x^5+x^4-x^3+x^2-x+1) Giúp mình vớiii

Toán Lớp 8: (X+1).(x^6-x^5+x^4-x^3+x^2-x+1)
Giúp mình vớiii

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    (x+1)(x^6-x^5+x^4-x^3+x^2-x+1)
    =x(x^6-x^5+x^4-x^3+x^2-x+1)+1(x^6-x^5+x^4-x^3+x^2-x+1)
    =x^7-x^6+x^5-x^4+x^3-x^2+x+x^6-x^5+x^4-x^3+x^2-x+1
    =x^7+(-x^6+x^6)+(x^5-x^5)+(-x^4+x^4)+(x^3-x^3)+(-x^2+x^2)+(x-x)+1
    =x^7+1

  2. (x + 1)(x^6 – x^5 + x^4 – x^3 + x^2 – x + 1)
    = x.x^6 + x.(-x^5) + x.x^4 + x.(-x^3) + x.x^2 + x .(-x) + x.1 + 1.x^6 + 1.(-x^5) + 1.x^4 + 1.(-x^3) + 1.x^2 + 1 .(-x) + 1.1
    = x^7 -x^6 + x^5 – x^4 + x^3 – x^2 + x + x^6 – x^5 + x^4 – x^3 + x^2 – x + 1
    = x^7 + (-x^6 + x^6) + (x^5 – x^5) + (-x^4 + x^4) + (x^3 – x^3) + (-x^2 + x^2) + (x – x) + 1
    = x^7 + 1

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

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