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calculati (a×b)×c daca a×c=1,2(5) si b =67/113

Răspuns :

a·c=113/90
a·(b·c)=abc=113/90·67/113=67/90
Inmultirea este asociativa (a·b)·c=(a·c)·b=1,2(5)·67/113=(113/90)·(67/113)=   67/90