Question

Tính

99-97+95-93+...7-5+3-1

Answer 1

99 - 97 + 95 - 93 + ... + 7 - 5 + 3 - 1

= (99 - 97) + (95 - 93) + ... + (7 - 5) + (3 + 1)

= 2 + 2 + ... + 2 + 2

= 2 . 50

= 100

Answer 2

99-97+95-93+..7-5+3-1

= (99-97)+(95-93)+...+(7-5)+(3-1)

= 2 + 2+ ...+2

= 100