Effectue les operations et donne les details de calcul: a=(-4)+(-9)  B=(+5)-(-3)     c=(-13)-(+7)    D=(-7)*(+3)        E=(-9)*(-5)      f=4*(-7.5)    E=(-4)*(+5)*(-6)*(-4)*(-1)                 (Le signe(*)veut dire multiplieé par ) mer ci
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