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

Toán Lớp 8: – 2(2x + 5)2 – (4x + 1)(1 – 4x) rút gọn

Toán Lớp 8: – 2(2x + 5)2 – (4x + 1)(1 – 4x)
rút gọn

Comments ( 2 )

  1. -2(2x + 5)^2 – (4x + 1)(1 – 4x)
    = -2[(2x)^2 + 2.2x.5 + 5^2] + [(4x)^2 – 1^2]
    = -2(4x^2 + 20x + 25) + (16x^2 – 1)
    = -8x^2 – 40x – 50 + 16x^2 – 1
    = 8x^2 – 40x – 51

  2. Giải đáp:
     8x^2 – 40x + 49
    Lời giải và giải thích chi tiết:
     -2(2x +5)^2 – (4x + 1)(1 – 4x)
    = -2(4x^2 + 20x + 25) – 1^2 + (4x)^2
    = -8x^2 – 40x – 50 – 1 + 16x^2
    = 8x^2 – 40x + 49

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