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

Toán Lớp 6: bài 4 tìm x , biết : b,123 . 25 – 5. ( 2345 – x : 11 ) = 17. 25 c, 2345 – 156 : ( 3 . x – 47 ) =1153 . 3 d, ( 86 : x -14 ) : 29 + 1140

Toán Lớp 6: bài 4 tìm x , biết :
b,123 . 25 – 5. ( 2345 – x : 11 ) = 17. 25
c, 2345 – 156 : ( 3 . x – 47 ) =1153 . 3
d, ( 86 : x -14 ) : 29 + 1140 : 76 = 16
e, 3 . ( x + 16 ) -2 x -18 =60
f, (3, x – 36 ) . ( 72- 432 : x )+ 19 . 54 =27.38

Comments ( 2 )

  1. Bài 4 :
    b,123.25 – 5. ( 2345 – x : 11 ) = 17. 25
    -> 3075 – 5.(2345 – x : 11) = 425
    -> 5.(2345 – x : 11) = 2650
    -> 2345 – x : 11 = 530
    -> x : 11 = 1815
    -> x = 165
    Vậy x=165
    c, 2345 – 156 : ( 3 . x – 47 ) = 1153 . 3
    -> 2345 – 156 : ( 3 . x – 47 ) = 3459
    -> 156 : ( 3 . x – 47 ) = -1114
    -> 3. x – 47 = -78/557
    -> 3x = 26101/557
    -> x ~~ 15,62
    d, ( 86 : x -14 ) : 29 + 1140 : 76 = 16
    -> ( 86 : x -14 ) : 29 + 15 = 16
    -> ( 86 : x -14 ) : 29 = 1
    ->  86 : x -14  = 29
    -> 86 : x = 43
    -> x = 2
    Vậy x = 2
    e, 3.( x + 16 ) -2x – 18 =60
    ->  3x + 48 – 2x – 18 =60
    -> 3x + 48 – 2x = 78
    -> x + 48= 78
    ->x = 30
    Vậy x = 30
    f, (3.x – 36 ).( 72- 432 : x )+ 19 . 54 =27.38
    -> (3.x – 36 ).( 72- 432 : x )+ 1026 =1026
    -> (3.x – 36 ).( 72- 432 : x ) = 0
    -> $\left[\begin{matrix} 3x – 36 = 0\\ 72 – 432 : x = 0\end{matrix}\right.$
    -> $\left[\begin{matrix} 3x = 36\\  432 : x = 72\end{matrix}\right.$
    -> $\left[\begin{matrix} x = 12\\  x = 6\end{matrix}\right.$
    Vậy x in {12,6}

  2. Giải đáp:
    b)x=165     c)x=26101/1671      d)x=1/2      e)x=30         f)x=16;6
    Lời giải và giải thích chi tiết:
    b)123 * 25 – 5*( 2345 – x :11 ) = 17*25 
    →3075-5*( 2345 – x :11 ) =425
    →5*( 2345 – x :11 )=2650
    →2345 – x :11=530
    →x:11=1815
    →x=165
    c)2345 – 156 : ( 3 * x – 47 ) =1153 * 3
    →2345 -156 : (3 * x- 47 ) = 3459
    →-156 🙁 3*x-47 ) =1114
    →3x- 47=- 156 : 1114
    →3x- 47=- 78/557
    →x=26101/1671
    d)(86 x-:14 ) : 29 + 1140 : 76 = 16
    →(86 x-:14 ) : 29 + 15 = 16
    →(86 x-:14 ) : 29=1
    →86:x-14  =29
    →86:x= 43
    →x=2
    e)3*( x + 16 ) -2 x -18 =60
    →3( x + 16 ) -2 x=78
    →x+48=78
    →x=30
    f)(3x – 36 ) * ( 72- 432 : x )+ 19 * 54 =27*38
    (3*x – 36 )*( 72- 432 : x ) = 0
    →\(\left[ \begin{array}{l}3x-36=0\\72-432:x=0\end{array} \right.\) 
    →\(\left[ \begin{array}{l}x=12\\x=6\end{array} \right.\) 

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

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