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Who can tell me the answer to the first section of the first chapter of the eighth grade mathematics textbook of Beijing Normal University?
Exercise 1. 1

1, (1)3x+8 >5x (2)x squared >: =0 (3) the area of the ocean on the earth >: the land area.

(4) teacher's age > 2* your age (5) shot put quality >; The quality of basketball

2、 1+3 & lt; 10 1+5 & lt; 10 1+7 & lt; 10 3+5 & lt; 10

3、600x+ 100( 10-x)>=4200

4、8x+4( 10-x)& lt; =72