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

Toán Lớp 7: ( 1/3+x ) : ( x = 3/4 ) = 7/9 Help me please, gấp lắm mn ơi

Toán Lớp 7: ( 1/3+x ) : ( x = 3/4 ) = 7/9 Help me please, gấp lắm mn ơi

Comments ( 1 )

  1. Giải đáp:
    x =9/8
    Lời giải và giải thích chi tiết:
    ( 1/3 + x ) : ( x + 3/4 ) = 7/9
    ( 1/3 + x ) = 7/9 . ( x + 3/4 ) 
    1/3 + x = 7/9 . x + 7/9 . 3/4
    1/3 + x = 7/9 . x + 7/12
    => 1/3 – 7/12 = 7/9 . x – x
    => 4/12 – 7/12 = 7/9 . x – 9/9 . x
    => (-1)/4 = (-2)/9 . x
    => x =  (-1)/4 : (-2)/9 
    => x = (-1)/4 . (-9)/2
    => x = 9/8
    Vậy x = 9/8

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