Salut,
2. a = 3^100:3^98
a = 3^(100-98)
a = 3²
a = 9.
b = 3•2-2
b = 6-2
b = 4.
Mg = √a•b
Mg = √9•4
Mg = √3²•2²
Mg = 3•2
Mg = 6.
3. {x;y} dp {5;4}
x/5 = y/4 = k.
x/5 = k → x = 5k.
y/4 = k → y = 4k.
x+y = 54
5k+4k = 54
9k = 54
k = 54/9
k = 6.
x = 5k → x = 5•6 → x = 30.
y = 4k → y = 4•6 → y = 24.
Succes! :3
