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bonjour
3 × a = 2
a = 2/3 ; 3 x 2/3 = 2
8 × a = 9
a = 9/8 ; 8 x 9/8 = 9
9 × a= 12
a = 12/9 = 4/3 ; 9 x 4/3 = 12
15 × a = 20
a = 20/15 = 4/3 ; 15 x 4/3 = 20
18 × a = 27
a = 27/18 = 3/2 ; 18 = 3/2 x 27
72 × a = 54
a = 54 /72 = 3/4 ; 72 x 3/4 = 54
Bonsoir;
3 × 2/3 = 2;
8 × 9/8 = 9;
9× 12/8 = 12;
15× 20/15 = 20;
18× 27/18 = 27;
72× 54/72 = 54.