bonjour
B = 5/2 + 5/7 - 10/3
on met toutes les fractions sous un même dénominateur qui sera 42
B = 5x21/2x21 + 5x6/7x6 - 10x14/3x14
B = 105/42 + 30/42 - 140/42 = - 5/42
C = 3/4 (1-7/3) + 8/7
on calcule dans les ( ) : 1 - 7/3 = 3/3 - 7/3 = - 4/3
C = 3/4 * (-4/3) + 8/7 = - 1 + 8/7 = -7/7 + 8/7 = 1/7
:)
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bonjour
B = 5/2 + 5/7 - 10/3
on met toutes les fractions sous un même dénominateur qui sera 42
B = 5x21/2x21 + 5x6/7x6 - 10x14/3x14
B = 105/42 + 30/42 - 140/42 = - 5/42
C = 3/4 (1-7/3) + 8/7
on calcule dans les ( ) : 1 - 7/3 = 3/3 - 7/3 = - 4/3
C = 3/4 * (-4/3) + 8/7 = - 1 + 8/7 = -7/7 + 8/7 = 1/7
:)