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