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

Toán Lớp 7: (2x+3)/(3x+1)=3/4.Mn giúp mik ik.

Toán Lớp 7: (2x+3)/(3x+1)=3/4.Mn giúp mik ik.

Comments ( 2 )

  1. ( 2x + 3 )/( 3x + 1 ) = 3/4
    ⇔ 4 . ( 2x + 3 ) = 3 . ( 3x + 1 )
    ⇔ 8x + 12 = 9x + 3
    ⇔ 9x – 8x = 12 – 3
    ⇔ x = 9
    Vậy , x = 9 .

  2. ( 2x + 3)/( 3x + 1) = 3/4
    4( 2x + 3) = 3( 3x + 1)
    8x + 12 = 9x + 3
    8x – 9x = 3 – 12
    -1x = -9
    x = -9 : (-1)
    x = 9
    #caty09
     

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