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la a si b faci impartiri
1935÷3=645
3241÷7=463
la c 6x8=48, deci 8 si 4 in minte
6x6=36+4 din minte=40
deci nr e 1608
1608÷6=268
la d 6x4=24, deci ultima cifra e 4, 2 in minte
4x7=28,
Deci nr este 2944
2944÷4=736
la e 1944÷4=486