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Sagot :

exercice n 1



A= 45-20-3+2
  = 25-3+2
 =22+2
=  24
   

B=24:4x6
 =6x6
=36

C=4x5-3x2+5
 =20-3x2+5
 =40-3+5
 =37+5
 =42

D=20:4+1-3x2
 =5+1-3x2
 =10+1-3
 =11-3
 =18

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