3074-1694=3074-1074-620=2000-600-200=1400-20=1380
368+3583=361+3590=3890+61=3951
157*47=157*50-157*3=7850-471=7450-71=7400-21=7379
123+75-37=123+77-39=200-39=161
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2)368+3583=3951
3)157•47=7379
4)123+(75-37)=161
3074-1694=3074-1074-620=2000-600-200=1400-20=1380
368+3583=361+3590=3890+61=3951
157*47=157*50-157*3=7850-471=7450-71=7400-21=7379
123+75-37=123+77-39=200-39=161