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

Toán Lớp 6: 357 – 3 . (31 – 2x) = 342 67 + 5.(3x – 15) = 367 7.(52 – 3x) – 25 = 192 Tìm số tự nhiên x ạ.

Toán Lớp 6: 357 – 3 . (31 – 2x) = 342
67 + 5.(3x – 15) = 367
7.(52 – 3x) – 25 = 192
Tìm số tự nhiên x ạ.

Comments ( 2 )

  1. 357 – 3 . (31 – 2x) = 342
             3 . (31 – 2x) = 357 – 342
             3 . (31 – 2x) = 15
                   31 – 2x  = 5
                          2x   = 26
                           x    = 13
    67 + 5 . (3x – 15) = 367
            5 . (3x – 15) = 300
                  3x – 15  = 60
                  3x          = 75
                    x          = 25
    7 . (52 – 3x) – 25 = 192
    7 . (52 – 3x)         = 217
          52 – 3x          = 31
                  3x          = 21
                    x          = 7
     

  2. a)
    357 – 3 (31-2x) = 342
    => 3 (31-2x) = 357 – 342
    => 3 (31-2x) = 15
    => 31 – 2x = 15 : 3
    => 31 – 2x = 5
    => 2x  = 31  – 5
    => 2x = 26
    =>x=26:2
    =>x=13
    Vậy x=13
    b)
    67 + 5 (3x-15) =367
    => 5 (3x-15) = 367-67
    => 5 (3x-15)=300
    =>3x-15=300:5
    =>3x-15=60
    =>3x=60+15
    =>3x=75
    =>x=75:3
    =>x=25
    Vậy x=25
    c)
    7 (52 -3x) – 25 =192
    => 7 (52-3x)=192+25
    => 7(52-3x) = 217
    =>52-3x=217:7
    =>52-3x=31
    => 3x=52-31
    =>3x=21
    =>x=21:3
    =>x=7
    Vậy x=7

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

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