Question

A=100+99-98-97+96+95-94-93+...+4+3-2-1

Answer 1

A=100+99-98-97+96+95-94-93+...+4+3-2-1

A=150

Answer 2

A = 100+99-98-97+96+95-94-93+.....+4+3-2-1.

A =  (100-98) + (99-97) + (96-94) + (95-93) + … + (4-2) + (3-1)

A = 2+2+2+2+…+2+2                 có 50 số hạng.

A = 2 x 50 = 100