Question

[tran thi ngoc huyen]

50-49+48-47+46-45+......+4-3+2-1

Answer 1

[Vũ Trụ Bao La]

=50-49+48-47+46-45+.....+4-3+2-1

=(50-49)+(48-47)+(46-45)+....+(4-3+2-1)

=1+1+1+...1+1

=25

**** bạn tran thi ngoc huyen