Question

(199+202+195+201+196+201+203+200+197+196)/10简便运算

Answer 1

= (200-1+200+2+200-5+200+1+200-4+200+1+200+3+200+200-3+200-4)/10
=(200*10-1+2-5+1-4+1+3-3-4)/10
=(200*10 -10)/10
=(200-1)*10/10
=199