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

Toán Lớp 6: 2. Tìm x a. 2/3 x + 5/7 = 3/10

Toán Lớp 6: 2. Tìm x
a. 2/3 x + 5/7 = 3/10

Comments ( 2 )

  1. 2/3 x + 5/7 = 3/10
    2/3 x           = 3/10 – 5/7 
    2/3x            = -29/70
    x                 =  -87/140

  2.  2/3 x + 5/7 = 3/10
     2/3 x             = 3/10 – 5/7
     2/3 x             = -29/70
             x              = -29/70 : 2/3
             x              = -87/140
               Vậy x = -87/140 

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