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

Toán Lớp 6: a) (x+2) : 4=2^3 . 3^2 b)(3.x – 2^4) . 7^3=2.7^4 c) [6x – 72) :2 – 84] .28=5628

Toán Lớp 6: a) (x+2) : 4=2^3 . 3^2
b)(3.x – 2^4) . 7^3=2.7^4
c) [6x – 72) :2 – 84] .28=5628

Comments ( 2 )

  1. a) (x+2) : 4=2^{3} . 3^{2}
     ( x +2 ) : 4 = 8 . 9
    ( x+ 2 ) : 4 = 72
    x+2= 72.4
    x+2 = 288
    x= 288-2
    x= 286
    Vậy x=286
    b)(3.x – 2^{4}) . 7^{3}=2.7^{4}
    3.x – 16=2.7^{4} : 7^{3}
    3.x – 16= 2. 7
    3.x – 16 =14
    3x = 30
    x=3:3 = 10
    Vậy x= 10
    c) [(6x – 72) :2 – 84] .28=5628
    6x – 72 :2 – 84= 5628 : 28
    6x – 36 – 84 =201
    6x= 201 + 84 + 36
    6x = 321
    x= 321: 6 = 53,5
    Vậy x= 53,5
     

  2. a)(x+2):4=2³.3²
    ⇔x+2=(8.9).4
    ⇔x+2=288
    ⇔x=286
    b)(3x-2^4).7^3=2.7^4
    ⇔(3x-2^4)=2.7^4:7^3
    ⇔3x-16=14
    ⇔3x=30
    ⇔x=10
    c) [(6x-72):2-84].28=5628
    ⇔(6x-72):2=201
    ⇔6x-72=402
    ⇔6x=474
    ⇔x=79

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

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