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

Toán Lớp 8: Rút gọn biểu thức sau 16x (x + 1) + (4x+3)(4x − 3) (4x − 2)(x + 5) − (2x − 3)²

Toán Lớp 8: Rút gọn biểu thức sau
16x (x + 1) + (4x+3)(4x − 3)
(4x − 2)(x + 5) − (2x − 3)²

Comments ( 2 )

  1. #huy
    a)16x (x + 1) + (4x+3)(4x − 3)
    =16x^2+16x-[(4x)^2-3^2]
    =16x^2+16x-16x^2+9
    =16x+9
    b)(4x − 2)(x + 5) − (2x − 3)^2
    =4x^2+20x-2x-10-(4x^2-12x+9)
    =4x^2+20x-2x-10-4x+12-9
    =30x-19
     

  2. 16x(x + 1) + (4x+3)(4x − 3)
    =16x^2+16x-16x^2+9
    =(16x^2-16x^2)+16x+9
    =16x+9
    (4x − 2)(x + 5) − (2x − 3)^2
    =4x^2+20x-2x-10-(4x^2-12x+9)
    =4x^2+20x-2x-10-4x^2+12x-9
    =(4x^2-4x^2)+(20x-2x+12x)+(-10-9)
    =30x-19

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

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