100-19-17-15-……-5-3-1用递等式怎么计算?

2024-11-07 18:50:16
推荐回答(1个)
回答(1):

递等式计算
100-19-17-15-……-5-3-1
=100-(19+17+15+...+3+1)
=100-(19+1)x10÷2
=100-20x10÷2
=100-100
=0