5.01+5.02+5.03+5.04...+5.99等于多少?

问题描述:

5.01+5.02+5.03+5.04...+5.99等于多少?

5.01+5.02+5.03+5.04...+5.99
=(5.01+5.99)×99(共99个数)÷2
=11×99÷2
=544.5