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

Toán Lớp 7: Tìm x biết : 11/13 – ( 5 /42 – x ) = – ( 15/28 – 11/13 )

Toán Lớp 7: Tìm x biết : 11/13 – ( 5 /42 – x ) = – ( 15/28 – 11/13 )

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    11/13 -(5/42-x)=-(15/28-11/13)
    => 11/13-(5/42-x)=-(-113/364)
    => 11/13-(5/42-x)=113/364
    => 5/42-x=11/13-113/364
    => 5/42-x=15/28
    => x=5/42-15/28
    => x=-5/12
    Vậy x=-5/12

  2. (11)/(13)-(5/(42)-x)=-((15)/(28)-(11)/(13))
    =>(11)/(13)-5/(42)+x=-(15)/(28)+(11)/(13)
    =>x=-(15)/(28)+(11)/(13)-(11)/(13)+5/(42)
    =>x=-(15)/(28)+5/(42)
    =>x=-(45)/(84)+(10)/(84)
    =>x=-5/(12)
    Vậy x=-5/(12)
     

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