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

Toán Lớp 6: Giups minh mn ơi! Câu cuối của mình ! (98-x) + (96-x)+…+(2-x)= 2205 Cảm ơn !!!

Toán Lớp 6: Giups minh mn ơi! Câu cuối của mình !
(98-x) + (96-x)+…+(2-x)= 2205
Cảm ơn !!!

Comments ( 2 )

  1. (98-x) + (96-x)+…+(2-x)= 2205

    <=>98-x + 96-x + . . . +2-x=2205

    <=>(98 + 96 + . . . + 2) – (x + x + . . . + x) = 2205

    <=>2450-x.49=2205

    =>x=5

     

  2. (98 – x) + (96 – x) + … + (2 – x) = 2205
    98 – x + 96 – x + … + 2 – x = 2205
    (98 + 96 + … + 2) – 49x = 2205
    2450 – 49x = 2205
    49x = 2450 – 2205
    49x = 245
    x = 245 : 49
    x = 5

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

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