Réponse :
Bonjour
2/7-3/8=16/56+-21/56=-5/56
5/4×12/25=60/100 réduis 3/5
2-1/9=18/9-1/9=17/9
9/7+2/3=27/21+14/21=41/21
15/8÷3/7=15/8×7/3=105/24=35/8
5÷3/4=5×4/3=20/3
Explications étape par étape :
Explications étape par étape:
a.
2/7 = (2×8)/(7×8)= 16/56
3/8 = (3×7)/(8×7) = 21/56
16/56 - 21/56 = -5/56 donc: 2/7 - 3/8 = -5/56
b.
5/4 × 12/25 = 60 /100 = 6/10 = 3/5
c.
2 = 18/9
18/9 - 1/9 = 17/9 donc 2 - 1/9 = 17/9
d. 9/7 = 27/21
2/3 = 14/21
27/21 + 14/21 = 41/21 donc 9/7 + 2/3 = 41/21
e. 15/8 ÷ 3/7 = 15/8 × 7/3 = 105/24 = 35/8 donc
15/8 ÷ 3/7 = 35/8
f. 5 ÷ 3/4 = 5 × 4/3 = 20/3
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Réponse :
Bonjour
2/7-3/8=16/56+-21/56=-5/56
5/4×12/25=60/100 réduis 3/5
2-1/9=18/9-1/9=17/9
9/7+2/3=27/21+14/21=41/21
15/8÷3/7=15/8×7/3=105/24=35/8
5÷3/4=5×4/3=20/3
Explications étape par étape :
Verified answer
Explications étape par étape:
a.
2/7 = (2×8)/(7×8)= 16/56
3/8 = (3×7)/(8×7) = 21/56
16/56 - 21/56 = -5/56 donc: 2/7 - 3/8 = -5/56
b.
5/4 × 12/25 = 60 /100 = 6/10 = 3/5
c.
2 = 18/9
18/9 - 1/9 = 17/9 donc 2 - 1/9 = 17/9
d. 9/7 = 27/21
2/3 = 14/21
27/21 + 14/21 = 41/21 donc 9/7 + 2/3 = 41/21
e. 15/8 ÷ 3/7 = 15/8 × 7/3 = 105/24 = 35/8 donc
15/8 ÷ 3/7 = 35/8
f. 5 ÷ 3/4 = 5 × 4/3 = 20/3