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

Toán Lớp 8: (x+3)^3-(x+2)(x^2-2x+1) rut gon giup mik a

Toán Lớp 8: (x+3)^3-(x+2)(x^2-2x+1)
rut gon giup mik a

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    (x+3)^3-(x+2)(x^2-2x+1)
    =x^3+9x^2+27x+27-(x^3+2x^2-2x^2-4x+x+2)
    =x^3+9x^2+27x+27-x^3+3x-2
    =9x^2+30x+25

  2. (x+3)^3-(x+2)(x^2-2x+1)~
    =x^3+3x^2.3+3x.3^2+3^3-(x^3+2^3)
    =x^3+9x^2+27x+27-x^3-8
    =(x^3-x^3)+9x^2+27x+27-8
    =9x^2+27x+19
     

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