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calculati in doua moduri:15•42+15•42cum ce rezolva ?




Răspuns :

15(42+42)=15*84=1260


15*42+15*42=630+630=1260
=15(42+42)=15x84=1260
si:
15x42+15x42=630+630=1260
si:
42(15+15)=42x30=1260