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

Toán Lớp 8: Chọn câu đúng. A. (5x – 4)2 – 49×2 = -8(3x + 1)(x + 2) B. (5x – 4)2 – 49×2 = (3x – 1)(x + 2) C. (5x – 4)2 – 49×2 = -8(3x – 1)(x – 2) D.

Home/ Toán Lớp 8: Chọn câu đúng. A. (5x – 4)2 – 49×2 = -8(3x + 1)(x + 2) B. (5x – 4)2 – 49×2 = (3x – 1)(x + 2) C. (5x – 4)2 – 49×2 = -8(3x – 1)(x – 2) D.

Toán Lớp 8: Chọn câu đúng. A. (5x – 4)2 – 49×2 = -8(3x + 1)(x + 2) B. (5x – 4)2 – 49×2 = (3x – 1)(x + 2) C. (5x – 4)2 – 49×2 = -8(3x – 1)(x – 2) D.

Tháng Tư 4, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: Chọn câu đúng. A. (5x – 4)2 – 49×2 = -8(3x + 1)(x + 2) B. (5x – 4)2 – 49×2 = (3x – 1)(x + 2) C. (5x – 4)2 – 49×2 = -8(3x – 1)(x – 2) D. (5x – 4)2 – 49×2 = -8(3x – 1)(x + 2)

Comments ( 1 )

  1. kymmailien
    kymmailien
    4 Tháng Tư, 2022 at 8:27 chiều
    Reply
    (5x – 4)^2 – 49x^2 = (5x – 4)^2 – (7x)^2           
    = (5x – 4 + 7x)(5x – 4 – 7x)           
    = (12x – 4)(-2x – 4)
    = 4.(3x – 1).(-2)(x + 2)
    = -8(3x – 1)(x + 2)
    => Ta chọn D
     

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

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