Dans chaque cas calculer la valeur du nombre r a ) r/8 = 2/3 b) 3/r = 4.8/7 c) 3/11 = 1.2/r

r/8 = 2/3
3r = 2 * 8
3r = 16
r = 16/3

S= {16/3}

3/r = 4.8/7
21 = 4,8r
21/4.8 = r
4,375 = r

S= {4,375}

3/11 = 1.2/r
3r = 11 * 1.2
3r = 13.2
r = 13.2/3
r = 4.4

S= {4,4}