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Folosing factorul comun, calculati:
12x89+78x12
\
2956x1995-1995x2955
\
123x389+123x11-50x123


Răspuns :

12 * 89 + 78 * 12 = 12(89 + 78) = 12 * 167 = 2004
2956 * 1995 - 1995 * 2955 = 1955(2956 - 2955) = 1955 * 1 = 1955
123 * 389 + 123 * 11 - 50 * 123 = 123(389 + 11 - 50) = 123 * 277 = 34071