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

Toán Lớp 8: (x^2-x+1)(x-1) (x^3-2x^2+x-1)(5-x) (c+3)(c-2)+(c+1)

Toán Lớp 8: (x^2-x+1)(x-1)
(x^3-2x^2+x-1)(5-x)
(c+3)(c-2)+(c+1)

Comments ( 2 )

  1. #Sad
    a)
    (x-1)(x^2-x+1)
    = x^3-x^2+x-x^2+x-1
    = x^3-2x^2+2x-1
    b)
    (x^3-2x^2+x-1)(5-x)
    = 5x^3-10x^2+5x-5-x^4+2x^3-x^2+x
    = -x^4+7x^3-11x^2+6x-5
    c)
    (c+3)(c-2)+(c+1)
    = c^2-2c+3c-6+c+1
    = c^2+2c-5

  2. Giải đáp:
    Bạn xem hình
    Chúc bạn hok tốt!!
    cho mik xin ctlhn nha
     

    toan-lop-8-2-1-1-3-2-2-1-5-c-3-c-2-c-1

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