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

Toán Lớp 7: Tìm x, biết (-21/13)× x + 1/3 = (-2/3) + 8/5

Toán Lớp 7: Tìm x, biết (-21/13)× x + 1/3 = (-2/3) + 8/5

Comments ( 2 )

  1. (-12/13) xx x + 1/3 = (-2/3) + 8/5
    => (-21/13) xx x  + 1/3 = 14/15
    => (-21/13) xx x = 14/15 – 1/3 = 3/5
    => x = 3/5 : (-21/13)
    => x = -13/35
     

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