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

Toán Lớp 6: Tính : 60 : { 7 – ( 11^2 – 20 . 6 ) + 5 } Tìm x : 135 + 3.5^2x-1 = 510 { 102 – x ) x 3 – 51 } : 3 – 2 = 3

Toán Lớp 6: Tính : 60 : { 7 – ( 11^2 – 20 . 6 ) + 5 }
Tìm x : 135 + 3.5^2x-1 = 510
{ 102 – x ) x 3 – 51 } : 3 – 2 = 3

Comments ( 1 )

  1. 60 : [ 7 – ( 11^2 – 20 . 6  ) + 5 ]
    = 60 : [ 7 – ( 121 – 120 ) + 5 ]
    = 60 : [ 7 – 1 + 5 ]
    = 60 : [ 6 + 5 ]
    = 60 : 11
    = 60/11
    135 + 3 . 5^{2x – 1} = 510
    3 . 5^{2x -1} = 510 – 135
    3 . 5^{2x -1} = 375
    5^{2x -1} = 375 : 3
    5^{2x -1} = 125
    5^{2x -1} = 5^3
    => 2x – 1 = 3
    2x = 3 + 1
    2x = 4
       x = 4 : 2
        x = 2
    Vậy x= 2
    [( 102 – x ) × 3 – 51] : 3 – 2 = 3
    [( 102 – x ) × 3 – 51] : 3 = 3 + 2
    [( 102 – x ) × 3 – 51] : 3 = 5
    ( 102 – x ) × 3 – 51 = 5 × 3
    ( 102 – x ) × 3 – 51 = 15
    ( 102 – x ) × 3 = 15 + 51
    ( 102 – x ) × 3 = 66
    102 – x = 66 : 3
    102 – x = 22
              x = 102 – 22
              x = 80
    Vậy x = 80
    #dtkc

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

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