1) The factory can make a profit by producing type A masks (

0.5X) 1 10,000 yuan, and the production of type B masks can be profitable (

1.5-0.3X) ten thousand yuan; (2) The total profit of masks produced by this factory is (

1.5+0.2X) ten thousand yuan; (3) The production of type A masks is X million, and 600,000 masks can be produced every day, so it is necessary to (

X/0.6)d，

B produces (5-X) 10,000 masks, and can produce 8,000 masks a day, which requires (

(5-X)/0.8)d, if it is required to be completed within 8d (inclusive), then the inequality groups can be listed: (X >；; = 1.8

X/0.6+(5-X)/0.8 & lt； =8

)

Solve ① (

X & gt= 1.8),

Solve ② (

X & lt=4.2),

Solve this inequality set: (

1.8 & lt； = X & lt=4.2)