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

Toán Lớp 8: rút gọn (6x+5)×(6x-5)-(9x+1)×(4x+3)=0

Toán Lớp 8: rút gọn (6x+5)×(6x-5)-(9x+1)×(4x+3)=0

Comments ( 1 )

  1. $(6x+5)(6x-5)-(9x+1)(4x+3)=0$
    $⇔ 36x^2-25-(36x^2+31x+3)=0$
    $⇔ -31x – 28 = 0$
    $⇔ x=-\dfrac{28}{31}$

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