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Sagot :

SWNN
(2/7 + 1/14) * 3/2
= ( (2*2)/(7*2) + 1/14) * 3/2
= (4/14 + 1/14) * 3/2
= 5/14 * 3/2
= 5/14 * (3*7)/(2*7)
= 5/14 * 21/14
= (5*7*3)/(7*2*14) → simplification par 7
= 15/28

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