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

Toán Lớp 8: (3x-1)*(3x+2)-(3x+1) rút gọn

Toán Lớp 8: (3x-1)*(3x+2)-(3x+1) rút gọn

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    (3x-1)(3x+2)-(3x+1)
    =9x^2+6x−3x−2−3x-1
    =9x^2-3

  2. (3x-1)(3x+2)-(3x+1)
    =3x.3x+3x.2-3x.1-2.1-3x-1
    =9x^2+6x-3x-2-3x-1
    =9x^2+(6x-3x-3x)-(2+1)
    =9x^2-3
    $_Ativity_$
     

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

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