bonjour
A = 4/5 - 7/ 5 x 10/4
A = 4/5 - 70/20
A = 16/20 - 70/20
A = 54/20
A = 27/10 = 2.7
140 = 2 ² x 5 x 7
870 = 2 x 3 x 5 x 29
PGCD = 2 x 5 = 10
140/870 = 14/87
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bonjour
A = 4/5 - 7/ 5 x 10/4
A = 4/5 - 70/20
A = 16/20 - 70/20
A = 54/20
A = 27/10 = 2.7
140 = 2 ² x 5 x 7
870 = 2 x 3 x 5 x 29
PGCD = 2 x 5 = 10
140/870 = 14/87