Bonjour
Effectuer les opérations :
3/7 + 4/21
= (3 x 3)/(7 x 3) + 4/21
= 9/21 + 4/21
= (9 + 4)/21
= 13/21
-1/3 + 1
= -1/3 + (1 x 3)/(1 x 3)
= -1/3 + 3/3
= (-1 + 3)/3
= 2/3
1/2 + 1/4 + 1/8
= (1 x 4)/(2 x 4) + (1 x 2)/(4 x 2) + 1/8
= 4/8 + 2/8 + 1/8
= (4 + 2 + 1)/8
= 7/8
5/12 - 2/3
= 5/12 - (2 x 4)/(3 x 4)
= 5/12 - 8/12
= (-3/12)
= -3/(3 x 4)
= -1/4
1/2 x 8/6 x 3/2
= (1 x 8 x 3)/(2 x 6 x 2)
= (2 x 2 x 2 x 3)/(2 x 2 x 3 x 2)
= 1
-5/2 x (-2/3) x 3/5
= [-5 x (-2) x 3] / (2 x 3 x 5)
= 30/30
= 1
[(-2) x 5 x (-4) x 3 x 7 x (-5)] / [(-10) x 6]
= (-10 x (-2) x 2 x 3 x 7 x (-5)) / (-10 x 2 x 3)
= (-2) x 7 x (-5) x (-10 x 2 x 3)/(-10 x 2 x 3)
= 10 x 7
= 70
