Oblicz.
a) log₃ 9√3
b) log₃ √3/81
c) log¼ √2
d) log1/5 5√5
Rozpisać mi to ładnie.
a)
log₃ 9√3 = x
3^x = 9√3
3^x = 3^2 * 3^(1/2)
3^x = 3^(2 + 1/2)
3^x = 3^2,5
x = 2,5
log₃ 9√3 = x = 2,5
b)
log₃ √3/81 = x
3^x = √3/81
3^x = 3^(1/2) : 3^4
3^x = 3^(1/2 - 4)
3^x = 3^(-3,5)
x = -3,5
log₃ √3/81 = x = -3,5
c) log¼ √2 = x
(1/4)^x = √2
4^(-x) = 2^(1/2)
2^(-2x) = 2^(1/2)
-2x = 1/2
x = -1/4
log¼ √2 = x = -1/4
d)
log1/5 5√5 = x
(1/5)^x = 5√5
5^(-x) = 5 * 5^(1/2)
5^(-x) = 5^1,5
-x = 1,5
x = -1,5
log1/5 5√5 = x = -1,5
c)
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a)
log₃ 9√3 = x
3^x = 9√3
3^x = 3^2 * 3^(1/2)
3^x = 3^(2 + 1/2)
3^x = 3^2,5
x = 2,5
log₃ 9√3 = x = 2,5
b)
log₃ √3/81 = x
3^x = √3/81
3^x = 3^(1/2) : 3^4
3^x = 3^(1/2 - 4)
3^x = 3^(-3,5)
x = -3,5
log₃ √3/81 = x = -3,5
c) log¼ √2 = x
(1/4)^x = √2
4^(-x) = 2^(1/2)
2^(-2x) = 2^(1/2)
-2x = 1/2
x = -1/4
log¼ √2 = x = -1/4
d)
log1/5 5√5 = x
(1/5)^x = 5√5
5^(-x) = 5 * 5^(1/2)
5^(-x) = 5^1,5
-x = 1,5
x = -1,5
log1/5 5√5 = x = -1,5
a)
b)
c)
d)