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

Toán Lớp 8: (X-3)(x-1)-3(x-3) (X-1)(2x+1)×3(x-1)(x+2)(2x+1)

Toán Lớp 8: (X-3)(x-1)-3(x-3)
(X-1)(2x+1)×3(x-1)(x+2)(2x+1)

Comments ( 2 )

  1. a) (x-3)(x-1)-3(x-3)
    =(x^2 -x-3x+3)-(3x-9)
    =x^2 -4x-3x+3+9
    =x^2 -7x+12
    b) (x-1)(2x+1)xx3(x-1)(x+2)(2x+1)
    =3(x-1)^2 (2x+1)^2 (x+2)

  2. Giải đáp:+ Lời giải và giải thích chi tiết:
     (x – 3)(x – 1) – 3(x – 3)
    = x(x – 1) – 3(x – 1) – 3(x – 3)
    = x^2 – x – 3x + 3 – 3x + 9
    = x^2  – (x + 3x + 3x) + (3 + 9)
    = x^2 – 7x + 12
    ———————————————————————————-
    (x – 1)(2x + 1).3(x – 1)(x + 2)(2x + 1)
    = [(x – 1)(x – 1)][(2x + 1)(2x + 1)].3.(x + 2)
    = 3(x + 2)(x – 1)^2 (2x + 1)^2

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