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calculati: (-9 supra 10) + (-5 supra 12)+(+2 supra 15)+(-7 supra 30)=

Răspuns :

(-9/10) + (-5/12)+(+2/15)+(-7/30)=
=-9/10 -5/12+2/15-7/30=
=(-54-25+8-14)/60=
=85/60=17/12