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

Toán Lớp 6: `17.` 39 – 2 (x + 1) = 15 `18.` 30 + (76 – x) : 2 = 50 `19.` 2448 : [119 – (x – 6) ] = 24

Home/ Toán Lớp 6: `17.` 39 – 2 (x + 1) = 15 `18.` 30 + (76 – x) : 2 = 50 `19.` 2448 : [119 – (x – 6) ] = 24

Toán Lớp 6: `17.` 39 – 2 (x + 1) = 15 `18.` 30 + (76 – x) : 2 = 50 `19.` 2448 : [119 – (x – 6) ] = 24

Tháng Năm 11, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: 17. 39 – 2 (x + 1) = 15
18. 30 + (76 – x) : 2 = 50
19. 2448 : [119 – (x – 6) ] = 24

Comments ( 2 )

  1. tuanh
    tuanh
    11 Tháng Năm, 2022 at 5:51 chiều
    Reply
    17.
    39 – 2 (x+1) = 15
    2 (x+1) = 39-15
    2 (x+1) = 24
    x+1 = 24:2
    x+1 = 12
    x = 12-1
    x=11
    Vậy x =11
    _________________________________
    18.
    30 + (76 – x) : 2 = 50
    (76-x):2 = 50-30
    (76-x):2 = 20
    76-x = 20 xx 2
    76-x = 40
    x = 76-40
    x = 36
    Vậy x=36
    ____________________________________
    19.
    2448 : [119 – (x-6)] = 24
    119 – (x-6) = 2448 : 24
    119 – (x-6) = 102
    x-6 = 119-102
    x-6 = 17
    x=17+6
    x = 23
    Vậy x = 23
     

  2. minhhaanh
    minhhaanh
    11 Tháng Năm, 2022 at 5:51 chiều
    Reply
    $\text{17.}$
    $\text{39 – 2 . ( x + 1 ) = 15}$
    $\text{⇔ 2 . ( x + 1 ) = 39 – 15}$
    $\text{⇔ 2 . ( x + 1 ) = 24}$
    $\text{⇔ x + 1 = 24 : 2}$
    $\text{⇔ x + 1 = 12}$
    $\text{⇔ x = 12 – 1}$
    $\text{⇔ x = 11}$
    $\text{Vậy x = 11}$
    $\text{18.}$
    $\text{30 + ( 76 – x ) : 2 = 50}$
    $\text{⇔ ( 76 – x ) : 2 = 50 – 30}$
    $\text{⇔ ( 76 – x ) : 2 = 20}$
    $\text{⇔ 76 – x = 20 . 2}$
    $\text{⇔ 76 – x = 40}$
    $\text{⇔ x = 76 – 40}$
    $\text{⇔ x = 36}$
    $\text{Vậy x = 36}$
    $\text{19.}$
    $\text{2448 : [ 119 – ( x – 6 )] = 24}$
    $\text{⇔ 119 – ( x – 6 ) = 2448 : 24}$
    $\text{⇔ 119 – ( x – 6 ) = 102}$
    $\text{⇔ x – 6 = 119 – 102}$
    $\text{⇔ x – 6 = 17}$
    $\text{⇔ x = 17 + 6}$
    $\text{⇔ x = 23}$
    $\text{Vậy x = 23}$

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

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