bonjour
A = 20/12 - 5/15 = 100 /60 - 20/60 = 80/60 = 4/3
B = 28/48 x - 62/32 = - 1736/1536 =-217/192
C = 9/7 - 30/ 630
= 9/7 - 1/21
= 27/21 - 1/ 21 = 26 /21
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bonjour
A = 20/12 - 5/15 = 100 /60 - 20/60 = 80/60 = 4/3
B = 28/48 x - 62/32 = - 1736/1536 =-217/192
C = 9/7 - 30/ 630
= 9/7 - 1/21
= 27/21 - 1/ 21 = 26 /21