The first chapter is rational number 1. 1 positive and negative numbers1.b2.c3.d4.b5.b7.d8.c9.1,-10. -32m，80 1 1. 16，24 12。 Monday-1.8 million yuan, 220,000 yuan, 3 1.5 million yuan, 400,000 -0.8 million yuan, 5 1 10,000 yuan, 620,000 yuan, and-25,000 yuan per day 13. ((90+10)+(90-5)+90+(90+8)+(90-3)) divided by 5=92 minutes 14. ( 1)-