Question

Решить удобным способом:
2010×35-15×2009+50×2009

Answer 1

2010 * 35 - 15 * 2009 + 50 * 2009 = 
= 2010 * 35 + (50 * 2009 - 15 * 2009) = 
= 2010 * 35 + 35 * 2009 = 
= 35 * (2010 - 2009) = 
= 35 * 1 = 35