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

Toán Lớp 6: Tim số tự nhiên x, biết a) 70- 5. (x-3)-45 b) 10x – 2x-256 : 16 e) (9x +2). 3-60 d) (x-53)+46-95 e) 71+ (26-3x): 5- 75 D 176. (2x -53)-

Tháng Sáu 1, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: Tim số tự nhiên x, biết
a) 70- 5. (x-3)-45
b) 10x – 2x-256 : 16
e) (9x +2). 3-60
d) (x-53)+46-95
e) 71+ (26-3x): 5- 75
D 176. (2x -53)-176

Comments ( 2 )

  1. lantrungbach
    lantrungbach
    1 Tháng Sáu, 2022 at 6:30 sáng
    Reply
    a) 70 – 5 . ( x – 3 ) = 45
    5 . ( x – 3 ) = 70 – 45
    x – 3 = 25 : 5
    x = 5 + 3
    x = 8
    b) 10x – 2x = 256 : 16
    x . ( 10 – 2 ) = 16
    x . 8 = 16
    x = 16 : 8
    x = 2
    c) ( 9x + 2 ) . 3 = 60
    9x + 2 = 60 : 3
    9 . x = 20 – 2
    x = 18 : 9
    x = 2
    d) ( x – 53 ) + 46 = 95
    x – 53 = 95 – 46
    x = 49 + 53
    x = 102
    e) 71 + ( 26 – 3x ) : 5 = 75
    ( 26 – 3x ) : 5 = 75 – 71
    26 – 3x = 4 × 5
    3 . x = 26 – 20
    x = 6 : 3
    x = 2
    f) 176 . ( 2x – 53 ) = 176
    2x – 53 = 176 : 176
    2 . x = 1 + 53
    x = 54 : 2
    x = 27

  2. diemmyhoa
    diemmyhoa
    1 Tháng Sáu, 2022 at 6:29 sáng
    Reply
    a)70−5.(x−3)=45
    5.(x−3)=70−45
    5.(x−3)=25
    x-3=25:5
    x-3=5
    x=5+3
    x=8
    Vậy x=8
    b)10x−2x=256:16
    x.(10−2)=16
    x.8=16
    x=16:8
    x=2
    Vậy x=2
    c)(9x+2).3=60
    9x+2=60:3
    9x+2=20
    9x=20-2
    9x=18
    x=18:9
    x=2
    Vậy x=2
    d)(x−53)+46=95
    x−53=95−46
    x=49
    x=49+53
    x=102
    Vậy x=102
    e)71+(26−3x):5=75
    (26−3x):5=75−71
    (26−3x):5=4
    26-3x=4×5
    26-3x=20
    3x=26−20
    3x=6
    x=6:3
    x=2
    Vậy x=2
    d)176.(2x−53)=176
    2x−53=176:176
    2x-53=1
    2x=1+53
    2x=54
    x=54:2
    x=27
    Vậy x=27
     

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

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