Réponse :
Bonsoir
Explications étape par étape :
A = 2/3 + 1/4 -5/9
A = 2/3 X 12/12 + 1/4 X 9/9 -5/9 X 4/4
A = 24/36 -9/36 -20/36
A = -5/36
B = ( 3 - 3/7) X (8/3 -10/9)
B = ( 3 X 7/7 - 3/7) X ( 8/3 X 9/9 - 10/9 X 3/3)
B = (21/7 - 3/7) X ( 72/27 -30/27)
B = (18/7 ) X ( 42/27)
B = 756/189
B = 84/21 : 3/3 = 28/7 = 4
C = 4/5 + 8/3 = 4/5 X 3/3 + 8/3 X 5/5 = 12/15 + 40/15
11/5 -3/4 11/5 X 4/4 -3/4 X 5/5 44/20 - 15/20
C = 52/15 : 29/20
C = 52/15 X 20/29
C = 1040/435
C = 208/87
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Réponse :
Bonsoir
Explications étape par étape :
A = 2/3 + 1/4 -5/9
A = 2/3 X 12/12 + 1/4 X 9/9 -5/9 X 4/4
A = 24/36 -9/36 -20/36
A = -5/36
B = ( 3 - 3/7) X (8/3 -10/9)
B = ( 3 X 7/7 - 3/7) X ( 8/3 X 9/9 - 10/9 X 3/3)
B = (21/7 - 3/7) X ( 72/27 -30/27)
B = (18/7 ) X ( 42/27)
B = 756/189
B = 84/21 : 3/3 = 28/7 = 4
C = 4/5 + 8/3 = 4/5 X 3/3 + 8/3 X 5/5 = 12/15 + 40/15
11/5 -3/4 11/5 X 4/4 -3/4 X 5/5 44/20 - 15/20
C = 52/15 : 29/20
C = 52/15 X 20/29
C = 1040/435
C = 208/87