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

Toán Lớp 6: – 15 . ( x – 2 ) + 7 . ( 3 – x ) =7

Toán Lớp 6: – 15 . ( x – 2 ) + 7 . ( 3 – x ) =7

Comments ( 2 )

  1. Giải đáp: x=2
    Lời giải và giải thích chi tiết:
    -15(x-2)+7(3-x)=7
    -15x+30+21-7x=7
    (-15x-7x)+(30+21)=7
    -22x+51=7
    -22x=7-51
    -22x=-44
    x=-44/-22
    x=2
     

  2. -15. (x-2)+7.(3-x)=7
    ⇔-15x+30+21-7x=7
    ⇔-(15x+7x)+(30+21)=7
    ⇔-22x+51=7
    ⇔-22x=7-51
    ⇔-22x=-44
    ⇔x=(-44):(-22)
    ⇔x=2
     

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