Question

15+(1000-998)+(998-996)+(996-994)+....+(102-100)+(100-98)=

bỏ ngoặc rút gọn rồi tính

Answer 1

15+(1000-998)+(998-996)+(996-994)+....+(102-100)+(100-98)

= 15+1000-998+998-996+996-994+....+102-100+100-98

= 15 + 1000 - 98 = 917

Answer 2

\(15+\left(1000-998\right)+\left(998-996\right)+\left(996-994\right)+...+\left(102-100\right)+\left(100-98\right)=15+2+2+...+2=15+226\times2=467\)

Answer 3

15+(1000-998)+(998-996)+...+(102-100)+(100-98)

=15+1000-998+998-996+...+102-100+100-98

=15+1000+(998-998)+(996-996)+...+(102-102)+(100-100)-98

=15+1000+0+0+...+0+0-98

=917

Answer 4

\(15+\left(1000-998\right)+\left(998-996\right)+...+\left(102-100\right)+\left(100-98\right)\)

\(=15+1000-98\)

\(=1015-98\)

=917