01+0.02+0.03+0.04+…+0.96+0.97+0.98+0.99=
问题描述:
01+0.02+0.03+0.04+…+0.96+0.97+0.98+0.99=
答
1+2+3+4+…+99
=(99+1)×99÷2
=9900÷2
=4950
4950÷100=49.5.