Bonjour,
( 7/12 - 1/4 ) + ( 7/3 - 5/4 )
= [(7/12 - (1 x 3) / (4 x 3)]+ [(7 x 4) / (3 x 4) - (5 x 3) / (4 x 3))
= (7/12 - 3/12) + (28/12 - 15/12)
= 4/12 + 13/12
= 17/12.
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Bonjour,
( 7/12 - 1/4 ) + ( 7/3 - 5/4 )
= [(7/12 - (1 x 3) / (4 x 3)]+ [(7 x 4) / (3 x 4) - (5 x 3) / (4 x 3))
= (7/12 - 3/12) + (28/12 - 15/12)
= 4/12 + 13/12
= 17/12.