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

Toán Lớp 6: -(-219)+(-209)-422+12 20-(17+x)+55 tìm x

Toán Lớp 6: -(-219)+(-209)-422+12
20-(17+x)+55 tìm x

Comments ( 2 )

  1. -(-219)+(-209)-422+12
    = 219 – 209 – 422 + 12 
    = 10 – 422 + 12
    = -412 + 12 = -400
    Tìm x
    20-(17+x)=55
    17 + x = 20-55
    17 + x = -35
    x = -35 – 17 = -52
     

  2. a)
    -(-219)+(-209)-422+12
    =219+(-209)-422+12
    =10-422+12
    =-412+12
    =-400
    b)
    20-(17+x)=55
    (17+x)=20-55
    17+x=-35
    x=-35-17
    x=-52
    Vậy x=-52

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

About Thúy Mai