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

Toán Lớp 6: Tìm x a) 2^x=16 b)4^x=64 c)15^x=225 d)3^x.3=243 e)2^x.7=56 g)x^6÷x^3=125

Toán Lớp 6: Tìm x
a) 2^x=16
b)4^x=64
c)15^x=225
d)3^x.3=243
e)2^x.7=56
g)x^6÷x^3=125

Comments ( 2 )

  1. a,
    2^x=16=2^4
    Vậy x=4
    b,
    4^x=64=4^3
    Vậy x=3
    c,
    15^x=225=15^2
    Vậy x=2
    d,
    3^x. 3=243
    ⇔3^(x+1)=3^4
    ⇔x+1=4⇒x=3
    e,
    2^x. 7=56
    ⇔2^x=8=2^3
    ⇒x=3
    f,
    x^6: x^3=125
    ⇔x^3=125=5^3
    ⇒x=5
     

  2. a) 2^x=16
        2^x=2^4
        x=4

    b) 4^x=64
        4^x=4^3

        x=3
    c)15^x=225
       15^x=15^2
       x=2

    d)3^x.3=243
       3^x=243:3=81
       3^x=3^4
       x=4

    e)2^x.7=56
       2^x=56:7=8
       2^x=2^3
       x=3
    g)x^6:x^3=125
        x^3=125
        x^3=5^3
        x=5
      
     

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