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

Toán Lớp 8: (2x-5)(2x+5)-(2x-3)^2=100 tìm x hộ mình với

Toán Lớp 8: (2x-5)(2x+5)-(2x-3)^2=100
tìm x hộ mình với

Comments ( 2 )

  1. BẠN THAM KHẢO Ạ!!!
     (2x-5).(2x+5)-(2x-3)²=100
    ↔ ( 4x²-25)-( 4x²-12x+9)=100
    ↔ 4x²-25-4x²+12x-9=100
    ↔ (4x²-4x²)-(25+9)+12x=100
    ↔ 12x-34=100
    ↔ 12x=134
    ↔ x=67/6
    Vậy x=67/6
    CHÚC BN HC TỐT!!!
    #anhnguyenff

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

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