Sagot :
Réponse :
a) 12/5-3/5×7/9
=12/5-21/45
=12/5-7/15
= 29/15
b) (2/3-3)÷1/9
=-7/3÷1/9
=-21
c) 5+(1+1/8)÷3/4
=5+9/8÷3/4
=5+3/2
=13/2
e) 3/5-1/5×(5/2+2)
=3/5-1/5×9/2
=3/5-9/10
=-3/10
Explications étape par étape
Réponse :
Bonsoir
Explications étape par étape
A = 12/5 -3/5 X 7/9
A = 12/5 -21/45
A = 12/5 X 9/9 -21/45
A = 108/45 -21/45
A = 87/45 = 29/15
B = (2/3 -3) : 1/9
B = (2/3 -3 X 3/3) X 9/1
B = (2/3 -9/3) X 9/1
B = -7/3 X 9/1
B = -63/3 = -21
C = 5 + (1 +1/8) : 3/4
C = 5 + (1 X 8/8 +1/8) X 4/3
C = 5 + (8/8 +1/8) X 4/3
C = 5 +9/8 X 4/3
C = 5 +36/24
C = 5 X 24/24 +36/24
C = 120/24 +36/24
C = 156/24 = 26/4 = 13/2
E = 3/5 -1/5 X (5/2 +2)
E = 3/5 -1/5 X (5/2 +2 X 2/2)
E = 3/5 -1/5 X (5/2 +4/2)
E = 3/5 -1/5 X 9/2
E = 3/5 -9/10
E = 3/5 X 2/2 -9/10
E = 6/10 -9/10
E = -3/10