2022-11-26 00:20发布
0到9二位数也就是10到99，求这些两位数的和。按等差数列计算n项和，a1=10，an=99，d=1，根据an=a1+（n-1）d，n=（an-a1）/d+1=
0+9=91+8=92+7=93+6=94+5=95+4=96+3=97+2=98+1=99+0=9
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0+9=9
1+8=9
2+7=9
3+6=9
4+5=9
5+4=9
6+3=9
7+2=9
8+1=9
9+0=9
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