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

Toán Lớp 5: 3 phần 5 x (x-1)= 15 phần 21

Toán Lớp 5: 3 phần 5 x (x-1)= 15 phần 21

Comments ( 2 )

  1. 3/5 xx (x – 1) = 15/21
                x – 1    = 15/21 : 3/5
                x – 1    = 15/21 xx 5/3
                x – 1    = 25/21
                         x = 25/21 + 1
                         x = 46/21
    Vậy x = 46/21

  2. 3/5 × (x-1) = 15/21
    x – 1 = 15/21 : 3/5
    x – 1 = 25/21
    x = 25/21 + 1
    x = 46/21

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