Forum di corso

A- t1/2= 5,730 anni
10 ^-12 -> 100%
1,2 x 10^-13 -> 12%
5,730 -> 50%
12%-> 1,3752anni

B 1) 2^6= 64
2) 2^(8x1/2)= 4^(1/1/2)
3) 4^(4-x) x 4^(x+7) = 4^(x^2-4x-10)
4^(4-x+x+7) = 4^(x^2-4x-10)
11= x^2-4x-10
X^2-4x-21=0
x= 7 o -3
4).
5).
6)
C 1) log 2(x)= 3
x= 2^3
x= 8
2) log (x^2-3x+1)
X^2-3x=0
x= (3+sqrt (6))/2 o(3-sqrt (6))/2
3)
4) log (3x-1) > log (7-x)
3x-1>7-x
x>2