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calculati in doua moduri :

2011×3211-3211+2010×1789


Răspuns :

2011x3211-3211+2010x1789=3211x(2011-1)+2010x1789=3211x2010 +2010x1789=
=2010x(3211+1789)=2010x5000=10.050.000  sau
2011x3211-3211+2010x1789=
=(2010+1)x3211-3211+2010x1789=2010x3211+3211-3211+2010x1789=
=2010x(3211+1789)=2010x5000=10.050.000
2011 x(3211 - 3211 + 2010) x 1789 
2011 x 2010 -1789