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

Toán Lớp 6: 5.2x-1 = 20 giúp e với a cj ới

Toán Lớp 6: 5.2x-1 = 20
giúp e với a cj ới

Comments ( 2 )

  1. 5.2x-1=20
    5.2x=20+1
    5.2x=21
    10x=21
    x=21:10
    x=2,1
    vậy x=2,1
     

  2. 5 . 2x – 1 = 20
    5 . 2x = 20 + 1
    5 . 2x = 21
    2x = 21 : 5
    2x = 4,2
    x = 4,2 : 2
    x = 2,1.

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

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