1+2+3+4+......+97+98+99简便方法计算?

2025-03-03 18:16:00
推荐回答(3个)
回答1:

(1+99)x99÷2
=100x99÷2
=9900÷2
=4950

回答2:

=(1+99)*99/2
=100*99/2
=100/2*99
=50*99
=50*100-50*1
=5000-50
=4950

回答3:

=(1+99)+(2+98)+……+(49+51)+50=100×49+50=4950