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

Toán Lớp 7: Tìm số tự nhiên n biết: (4n + 5 ) :3 – 1 . 21 : 11 = 4

Toán Lớp 7: Tìm số tự nhiên n biết:
(4n + 5 ) :3 – 1 . 21 : 11 = 4

Comments ( 2 )

  1. (4n + 5) : 3 – 1 . 21 : 11 = 4
    (4n + 5) : 3 – 21 : 11 = 4
    (4n + 5) : 3 = 4 + 21/11
    (4n + 5) : 3 = 65/11
    (4n + 5) = 65/11 xx 3
    4n + 5 = 195/11
    4n = 195/11 – 5
     4n = 140/11
     n = 140/11 : 4
     n = 35/11
    $\text{Vậy}$  n = 35/11

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

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