Last Friday, 43 books were lent out.

(2)8-(-7),

=8+7,

= 15 (volume);

Last Tuesday, I borrowed 65,438+05 more books than last Friday.

(3)(0+8+6-2-7)÷5+50,

=5÷5+50,

= 1+50,

=5 1 (volume);

A: Last week, an average of 565,438+0 books were lent out every day.