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a fost răspuns

calculati: [-13sura20-(12supra15-3supra4)]-[7supra20+(9supra+15supra21)] ajutati-ma va rog :(

Răspuns :

=[-13/20-(12·4-3·15)/60]-[7/20+(9·21+15·4)/84]=
=[-13/20-3/60]-[7/20+249/84]=
=(-13·3-3)/60-(-7·21+249·5)/420=
=-36/30-1098/420=
=(-36·14-1098)/420=-1602/420=simplif=-267/70

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