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

Toán Lớp 8: Tìm x: (4x-3)(4x+2)+(4x+5)(1-4x)=2.5mũ2

Toán Lớp 8: Tìm x:
(4x-3)(4x+2)+(4x+5)(1-4x)=2.5mũ2

Comments ( 2 )

  1. Mời bạn tham khảo !!!
    Giải đáp:
    (4x – 3) . (4x + 2) + (4x + 5) . (1 – 4x) = 2 . 5^2
    ↔ 16x^2 + 8x – 12x – 6 + 4x – 16x^2 + 5 – 20x = 2 . 25
    ↔ -20x – 1 = 50
    ↔ -20x = 51
    ↔ x = (-51)/20
     

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

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