(2) The following three numbers are 9,-10,11; No. 10-10,No. 100-100, No.200 -200, No.20 1, No.20 1

(3) The last three numbers are 1/8,-1/9,110; Number10-110, number100-100, number 200-1/200, number 20/kloc.

Cut a rectangular piece of paper into two parts along a straight line with scissors, so that the two parts can be combined into parallelogram, triangle and trapezoid. How should I cut it? From one corner to the opposite midpoint.

There are no books, and I don't know what the other problem is.