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

Toán Lớp 6: Tìm x biết: e. (x – 45).27 = 0 f. 156 -(x + 61) = 82 g. (x – 35) – 120 = 0 h. x : 13 = 41 i. 1428 : x = 14 j. [(6x – 72): 2 – 84].28 =

Toán Lớp 6: Tìm x biết:
e. (x – 45).27 = 0
f. 156 -(x + 61) = 82
g. (x – 35) – 120 = 0
h. x : 13 = 41
i. 1428 : x = 14
j. [(6x – 72): 2 – 84].28 = 56

Comments ( 2 )

  1. e)(x-45).27=0
    x-45=0:27
    x-45=0
    x=0+45
    x=45
    f)156-(x+61)=82
    x+61=156-82
    x+61=74
    x=74-61
    x=13
    g)(x-35)-120=0
    x-35=0+120
    x-35=120
    x=120+35
    x=155
    h)x:13=41
    x=41.13
    x=533
    i)1428:x=14
    x=1428:14
    x=102
    j)[(6x-72):2-84].28=56
    (6x-72):2-84=56:28
    (6x-72):2-84=2
    (6x-72):2=2+84
    (6x-72):2=86
    6x-72=86.2
    6x-72=172
    6x=172+72
    6x=244
    x=244:6
    x=244/6
    x=122/3
     

  2. Lời giải chi tiết:
    e) (x-45).27=0
    =>x-45=0
    =>x=0+45
    =>x=45
    Vậy x=45
    f) 156-(x+61)=82
    =>x+61=156-82
    =>x+61=74
    =>x=74-61
    =>x=13
    Vậy x=13
    g) (x-35)-120=0
    =>x-35=0+120
    =>x-35=120
    =>x=120+35
    =>x=155
    Vậy x=155
    h) x:13=41
    =>x=41xx13
    =>x=533
    Vậy x=533
    i) 1428:x=14
    =>x=1428:14
    =>x=102
    Vậy x=102
    j) [(6x-72):2-84].28=56
    =>(6x-72):2-84=56:28
    =>(6x-72):2-84=2
    =>(6x-72):2=2+84
    =>(6x-72):2=86
    =>6x-72=86xx2
    =>6x-72=172
    =>6x=172+72
    =>6x=244
    =>x=244:6
    =>x=122/3
    Vậy x=122/3
    @uniquetimehunter

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

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