Выполни умножение 3.11

3.11 a) $155 \cdot 9 = 1395$ б) $57 \cdot 34 = 1938$ в) $296 \cdot 8 = 2368$ г) $68 \cdot 93 = 6324$ 3.12 a) $667 \cdot 14 = 9338$ б) $705 \cdot 29 = 20445$ в) $718 \cdot 208 = 149344$ г) $303 \cdot 406 = 123018$ 3.13 a) $3574 \cdot 742 = 2652000 + 285920 + 14296 + 7148 = 2651828 + 21444 = 2673272$ б) $6405 \cdot 907 = 5764500 + 5824535$ в) $2218 \cdot 2244 = 4436000 + 443600 + 88720 + 8872 = 4973000 + 53232 = 4973292$ г) $3004 \cdot 5005 = 15020000 + 15020 + 12016 = 15035036$ 3.14 a) $48 \cdot 100 = 4800$ б) $405 \cdot 30 000 = 12150000$ в) $6700 \cdot 89000 = 67 \cdot 89 \cdot 100000 = 596300000$ г) $1020 \cdot 3400 000 = 3468000000$ 3.15 a) $503 + 503 + 503 + 503 + 1 = 503 \cdot 4 + 1 = 2012 + 1 = 2013$ б) $515 + 515 + 9 + 15 = 515 \cdot 2 + 24 = 1030 + 24 = 1054$ в) $2018 + 602 + 602 + 602 + 602 + 602 = 2018 + 602 \cdot 5 = 2018 + 3010 = 5028$ г) $85 + 85 + 85 + 85 + 1250 + 1250 = 85 \cdot 4 + 1250 \cdot 2 = 340 + 2500 = 2840$