Why can not excel sum, such as happened 1.0459e-11

You to display the number of bits too little and too much

is that you store the results of the cell is too narrow bar, pull-point try wide.

You install in place, some functions must be fully installed circumstances to use, because some functions are complementary or mutually connectivity .2 who is a problem with the software itself.

The result is 1.0459 * 10 ^ 11 Format Cells for the value, decimal places to 0, on it