simplifier puis calculer A= (+6) -(+7) + (-12) - (- 4) +( +9) B =(-11) +( -14) - (+31) - (-21) +(+3O) - C =(-1) + (-2) -(-3) +(-4) +(+5)- (+6) D= (-23) +( +45) - (+ 67) +( + 23) - (-45) E= (-7,1) + (-9,5) -( -2,1) + (1,7) -(+4,3) E =(7,1)+(-9,5)-(-2,1) + ( +1,7)-(+4,3) merci beaucoup de votre aide
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