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

Toán Lớp 6: 25 -( 30 + x ) = x – ( 27 – 8 )

Toán Lớp 6: 25 -( 30 + x ) = x – ( 27 – 8 )

Comments ( 2 )

  1. $@Zeng$
    25-(30-x)=x-(27-8)
    ↔25-30-x=x-19
    ↔-x-x=-25+30-19
    ↔-2x=5-19
    ↔-2x=-14
    ↔x=-14:(-2)
    ↔x=7
     Vậy x=7

  2. Sử dụng quy tắc dấu ngoặc.
    25-( 30+x )=x-( 27-8 )
    25-30-x=x-19
    25-30+19=x+x
    ⇒14=2x
    ⇒x=7
    Vậy x=7
    Cách 2:

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