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Sagot :

Bonjour,

exercice 21

a= 55/5=  11

b= 21/3 = 7

c= 9*7/9 = 7

d = 3* 11/3 = 11

Exercice 22

a= 13*1/13 = 1

b= 11 ÷6  =11/6

c=  6 * 11/6 =11

d= 8* 7/8 = 7

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