问题
解答题
(5+9+13+…+49)-(3+7+11+…+47)
答案
(5+9+13+…+49)-(3+7+11+…+47),
=(5-3)+(9-7)+…+(49-47),
=2+2+…+2(12个2),
=2×12,
=24.
(5+9+13+…+49)-(3+7+11+…+47)
(5+9+13+…+49)-(3+7+11+…+47),
=(5-3)+(9-7)+…+(49-47),
=2+2+…+2(12个2),
=2×12,
=24.