0.9(50-x)+0.4x≤36①= = = & gt； x≥ 18

0.3(50-x)+x≤29②= = = & gt； x≤ 20

A: The range of X is l8≤ x≤20 (x is a positive integer).

x = 18， 19，20

(2) The number of pieces for making type A and type B ceramics is:

① 32 pieces of A-type pottery and 8 pieces of B-type pottery/KLOC-0;

(2) making 3/0/piece of A-type pottery and 0/9/piece of moon-type pottery;

③ Make 30 pieces of A-type pottery and 20 pieces of moon-type pottery.