A : 1 - (2/3+1/4) = 1 - (8/12 + 3/12) = 12/12 - (11/12) = 1/12
B : 3-5/2/1+1/5 - erreur d'énoncé..
4/5 x 35/8 = 4x35/5x8 = 4x7x5/5x4x2 = 7/2
bonjour
A = 1 - ( 2/3 + 1/4)
= 1 - ( 8/12 + 3/12)
= 12/12 - 11/12
= 1/12
B =( 3 - 5/2 ) : ( 1 + 1/5)
= ( 6/2 - 5/2 ) ; ( 5/5 + 1/5)
= 1/2 : 6/5
= 1/2 x 5/6
= 5/12
4/5 x 35/8 = 140 /40 = 7/2
1/12 + 5/12 + 7/2
= 1/12 + 5/12 + 42/12
= 48/12 = 4
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A : 1 - (2/3+1/4) = 1 - (8/12 + 3/12) = 12/12 - (11/12) = 1/12
B : 3-5/2/1+1/5 - erreur d'énoncé..
4/5 x 35/8 = 4x35/5x8 = 4x7x5/5x4x2 = 7/2
bonjour
A = 1 - ( 2/3 + 1/4)
= 1 - ( 8/12 + 3/12)
= 12/12 - 11/12
= 1/12
B =( 3 - 5/2 ) : ( 1 + 1/5)
= ( 6/2 - 5/2 ) ; ( 5/5 + 1/5)
= 1/2 : 6/5
= 1/2 x 5/6
= 5/12
4/5 x 35/8 = 140 /40 = 7/2
1/12 + 5/12 + 7/2
= 1/12 + 5/12 + 42/12
= 48/12 = 4