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Sagot :

SWNN
A = 8/3 - 5/3 / 20/21
A = 8/3 - 5/3 * 21/20
A = 8/3 - (5*7*3)/(3*5*4)
A = 8/3 - 7/4
A = (8*4)/(3*4) - (7*3)/(4*3)
A = 32/12 - 21/12
A = 11/12

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