12345×2345+2469×38275
=(12340+5)×2345+(2468+1)×38275
=1234×23450+11725+2×1234×38275+38275
=1234×(23450+76550)+50000
=123400000+50000
=123450000
123450000
12345×2345+2469×38275=2345×5×2469×38725=2469×(2345×5+38725)=2469×(11725+38275)=2469×50000=2469×5×10000=123450000