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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. $\frac{3}{5}$x(x-1)=$\frac{15}{21}$ 
    x-1=$\frac{15}{21}$:$\frac{3}{5}$
    (x-1)=$\frac{25}{21}$ 
    x=$\frac{25}{21}$+1
    x=$\frac{46}{21}$ 

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

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