Bonsoir j'ai un DM pour demain alors je voudrais l'aide la plus rapide voila les exercices :
NUM 1 : 42/75 - 22/30
NUM 2 : 85/4 + 25/5
NUM 3 : 12/25 - 8
NUM 4 : 9/18 - 5/30 + 9/6
NUM 5 : 3/7 + 2/5 - 4/3
NUM 1 : 42/75 - 22/30
NUM 2 : 85/4 + 25/5
NUM 3 : 12/25 - 8
NUM 4 : 9/18 - 5/30 + 9/6
NUM 5 : 3/7 + 2/5 - 4/3
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Verified answer
Bonsoir,
NUM 1 : 42/75 - 22/30
= (42 x 2) / (75 x 2) - (22 x 5) / (30 x 5)
= 84/150 - 110/150
= - 26 /150
= (2 x - 13) / (2 x 75)
= - 13/75
NUM 2 : 85/4 + 25/5
= (85 x 5) / (4 x 5) + (25 x 4) / (5 x 4)
= 425/20 + 100/20
= 525/20
= (5 x 105) / (5 x 4)
= 105/4
NUM 3 : 12/25 - 8
= 12/25 - (8 x 25) / (1 x 25)
= 12/25 - 200/25
= - 188/25
NUM 4 : 9/18 - 5/30 + 9/6
= (3 x 3) / (3 x 6) - (5 x 1) / (5 x 6) + 9/6
= 3/6 - 1/6 + 9/6
= 11/6
NUM 5 : 3/7 + 2/5 - 4/3
= (3 x 15) / (7 x 15) + (2 x 21) / (5 x 21) - (4 x 35) / (3 x 35)
= 45/105 + 42/105 - 140/105
= - 53/105
Verified answer
Réponse :
Bonsoir
Explications étape par étape
NUM 1 : 42/75 - 22/30
84/150 - 110/150 = -26/150 = -13/75
NUM 2 : 85/4 + 25/5
85/4 + 5 = 85/4 + 20/4 = 105/4
NUM 3 : 12/25 - 8
12/25 - 200/25 = -188/25
NUM 4 : 9/18 - 5/30 + 9/6
1/2 - 1/6 + 3/2 = 4/2 - 1/6 = 12/6 - 1/6 = 11/6
NUM 5 : 3/7 + 2/5 - 4/3
15/35 + 14/35 - 4/3 = 29/35 - 4/3 = 87/105 - 140/105 = -53/105