Enshi's green selenium-enriched products and special agricultural products are quite competitive in the international market, among which mushrooms are exported to Japan and South Korea.

Solution: (1) The functional relationship between y and x is as follows:

y=( 10+0.5x)(2000﹣6x)

That is: y =-3x2+940x+20000 (1≤ x ≤1/kloc-0, where x is an integer);

(2) From the meaning of the question:-3x2+940x+20000-10× 2000-340x = 22500.

Solve the equation: x 1 =50, x 2 =150 (irrelevant, omitted),

∴ Li Jing needs to store these mushrooms for 50 days to make a profit of 2,250 yuan;

(3) Let the profit be w, which is derived from the meaning in the question:

w=﹣3x 2 +940x+20000﹣ 10×2000﹣340x=﹣3(x﹣ 100)2+30000，

∵a=﹣3<； 0,

∴ Parabolic opening direction downward,

∴x= 100，w max =30000，

100 days < 1 10 days,

Store 100 days, and sell these mushrooms, and the maximum profit can be 30,000 yuan.