Bonjour
pyramides multiplicative :
• 1/2 x 2/3 = (1 x 2)/(2 x 3) = 1/3
• 2/3 x 3/4 = (2 x 3)/(3 x 4) = 2/4 = 2/(2 x 2) = 1/2
• 3/4 x 4/5 = (3 x 4)/(4 x 5) = 3/5
• 1/3 x 1/2 = 1/(2 x 3) = 1/6
• 1/2 x 3/5 = (1 x 3)/(2 x 5) = 3/10
• 1/6 x 3/10 = (1 x 3)/(6 x 10) = 3/(2 x 3 x 10) = 1/20
1/20
1/6 | 3/10
1/3 | 1/2 | 3/5
1/2 | 2/3 | 3/4 | 4/5
• 1/2 x ? = 5/3
? = 5/3 / 1/2
? = 5/3 x 2
? = 10/3
• 3/4 x ? = 1/5
? = 1/5 / 3/4
? = 1/5 x 4/3
? = 4/15
• 10/3 x 3/4 = 10/4 = (2 x 5)/(2 x 2) = 5/2
• 5/3 x 5/2 = 25/6
• 5/2 x 1/5 = 1/2
• 25/6 x 1/2 = 25/12
25/12
25/6 | 1/2
5/3 | 5/2 | 1/5
1/2 | 10/3 | 3/4 | 4/15
