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

Toán Lớp 6: 6) 2 . 3^x = 10 . 3^12 + 8 . 3^12

Toán Lớp 6: 6) 2 . 3^x = 10 . 3^12 + 8 . 3^12

Comments ( 2 )

  1. 6) 2 · 3^x = 10 · 3^12 + 8 · 3^12
        2 · 3^x = 3^12 · (10 + 8)
        2 · 3^x = 3^12 · 18
            2/18 = 3^12/3^x
              1/9 = 3^12/3^x
              1/9 = 3^12/3^21
                  x = 21
    Vậy x = 21
    CHÚC BẠN HỌC TỐT

  2. 2.3^x=10.3^12+8.3^12
    2.3^x=(10+8).3^12
    2.3^x=18.3^12
    2.3^x=2.3^3 .3^12
    2.3^x=2.3^15
    3^x=2.3^15 :2
    3^x=3^15
    =>x=15
    Vậy x=15

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