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Ex maths :aidez moi ex 29,30 svp
Ex maths :aidez moi ex 29,30 svp

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  • exercice 29
    A=(+8)+(-4)-(+5)-(-7)
      =8-4-5+7
      =4+2
      =6
    B=(-14)-(-23)+(+9)-(+21)
      =-14+23+9-21
      =-3
    C=(-8)-(+7)-(-18)-(+3)
      =-8-7+18-3
      =-15+15
      =0
    exercice 30
    A=(-1.7)+(+3.5)-(-2.3)
      =-1.7+3.5+2.3
      =1.8+2.3
      =4.1
    B=(-7.8)-(-11.4)-(+4.5)
      =-7.5+11.4-4.5
      =3.9-4.5
      =-0.6

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