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

Toán Lớp 6: Tìm x: c) 3x – 22 = 22 . 25 d) 125 . 5x – 3 = 57

Toán Lớp 6: Tìm x:
c) 3x – 22 = 22 . 25 d) 125 . 5x – 3 = 57

Comments ( 2 )

  1. \text{c) 3x – 22 = 22 . 25}
    \text{⇔ 3x = 22 . 25 + 22}
    \text{⇔ 3x = 22 . 26}
    \text{⇔ 3x = 572}
    ⇔ x = $\dfrac{572}{3}$ 
    _______________
    \text{d) 125 . 5x – 3 = 57}
    \text{⇔ 625 x = 57 + 3}
    \text{⇔ 625 x = 60}
    ⇔ x = $\dfrac{12}{125}$ 

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     3x -22 = 2^2. 5^5
    3x -22 =4.25
    3x = 100 + 22
    3x= 122
    x= 122:3
    x= 122/3
    vậy x= 122/3
    d)
    125.5x -3 = 57
    125.5x  = 57 +3 
    625x=60
    x = 60/625
    x =12/125
    vậy x= 12 /125

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

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