bonjour,
1) M = 20 755 / 9 488 - 3/8
PGDC de 20 755 et 9 488 = 593
on simplifie par 593 = 35/16
35/16 - 3/8 = 35/16 - 6/16 = 30/16 = 15/8 décimal
2 ) A = 8/3 - 5/3 : 20/21
8/3 - 5/3 x 21/20
= 8/3 - 105/60
= 8/3 - 7/4
= 32/12 - 21/12 = 11/12
3 ) ( 2 + 2/3) : ( 4/5 - 2/3)
= ( 6/3 + 2/3) : ( 12/15 - 10/15)
= 8/3 : 2/15
= 8/3 x 15/2
= 120/6 = 20
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bonjour,
1) M = 20 755 / 9 488 - 3/8
PGDC de 20 755 et 9 488 = 593
on simplifie par 593 = 35/16
35/16 - 3/8 = 35/16 - 6/16 = 30/16 = 15/8 décimal
2 ) A = 8/3 - 5/3 : 20/21
8/3 - 5/3 x 21/20
= 8/3 - 105/60
= 8/3 - 7/4
= 32/12 - 21/12 = 11/12
3 ) ( 2 + 2/3) : ( 4/5 - 2/3)
= ( 6/3 + 2/3) : ( 12/15 - 10/15)
= 8/3 : 2/15
= 8/3 x 15/2
= 120/6 = 20