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