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efectuati in multimea Z: a) (7-20)x(-3+5) b) (-5-7):(-6+2) c) -21:7+[42:(-6)]

Răspuns :

a) (7-20)x(-3+5)= (-17)x2=-34;
b) (-5-7):(-6+2)= (-12):(-4)=48;
c) -21:7+[42:(-6)]=(-3)+(-7)= -10