A: Within seven days, tourists are the most on the 5th and the least on the 6th. The difference between the two is 6.5438+0.8 million.

(2)10 * 7+[(-4)+6+5+2+8+(-10)+7] (Note: * is a multiplier)

=70+ 14

=84

A: The total number of tourists in these seven days is 840,000.