bonsoir
A = 1/5 x - 4 /3 + 7 /2
= - 4 /15 + 7 /2
= - 8 /30 + 105/30
= 97/30
B = 13 /7 - 8/7 : - 4/5
= 13/7 - 8 /7 * - 5/4
= 13/ 7 + 40/ 28
= 52/28 + 40 /28
= 92/28
= 23 / 7
C = ( 3/2 + 3 /5 ) ( 5/4 - 4 /3 )
= ( 15/10 + 6 /10 ) ( 15 /12 - 16/12)
= 21 /10 * - 1 /12
= - 21 / 120
= - 7 / 40
fais le dernier
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bonsoir
A = 1/5 x - 4 /3 + 7 /2
= - 4 /15 + 7 /2
= - 8 /30 + 105/30
= 97/30
B = 13 /7 - 8/7 : - 4/5
= 13/7 - 8 /7 * - 5/4
= 13/ 7 + 40/ 28
= 52/28 + 40 /28
= 92/28
= 23 / 7
C = ( 3/2 + 3 /5 ) ( 5/4 - 4 /3 )
= ( 15/10 + 6 /10 ) ( 15 /12 - 16/12)
= 21 /10 * - 1 /12
= - 21 / 120
= - 7 / 40
fais le dernier