Zhang Hua, a large strawberry grower, now sells 22 tons of strawberries. There are two sales channels: one is to ship strawberries to the provincial capital for direct wholesale to retailers, and the other is to retail them in the local market. After investigation and analysis, the daily sales volume and net profit per ton of these two sales channels are shown in the following table: affected by objective factors, Zhang Hua can only use one sales channel every day, and strawberries must be sold within 10 days. (1) if Some of the strawberries are shipped to the provincial capital for wholesale and the rest are sold in the local market. Please write down the functional relationship between the net profit y (yuan) of 22 tons of strawberries sold and the quantity x (tons) of strawberries transported to the provincial capital for direct wholesale and retail. (2) how to arrange the sales channels of 22 tons of strawberries so that Zhang Hua can obtain the maximum net profit Daily sales (tons) net profit per ton (yuan) provincial wholesale 4 1200 local retail 1 2000

Zhang Hua, a large strawberry grower, now sells 22 tons of strawberries. There are two sales channels: one is to ship strawberries to the provincial capital for direct wholesale to retailers, and the other is to retail them in the local market. After investigation and analysis, the daily sales volume and net profit per ton of these two sales channels are shown in the following table: affected by objective factors, Zhang Hua can only use one sales channel every day, and strawberries must be sold within 10 days. (1) if Some of the strawberries are shipped to the provincial capital for wholesale and the rest are sold in the local market. Please write down the functional relationship between the net profit y (yuan) of 22 tons of strawberries sold and the quantity x (tons) of strawberries transported to the provincial capital for direct wholesale and retail. (2) how to arrange the sales channels of 22 tons of strawberries so that Zhang Hua can obtain the maximum net profit Daily sales (tons) net profit per ton (yuan) provincial wholesale 4 1200 local retail 1 2000

(1) The formula is y = 1200X + 2000 (22-x) (2 points), i.e. y = - 800X + 44000 (3 points); (2) because strawberries must be sold out in 10 days, there are X4 + 22-x ≤ 10 (5 points), the solution is x ≥ 16, in the function y = - 800X + 44000, ∵ - 800 < 0, ∵ y decreases with the increase of X (8 points

In triangle ABC, angle B is equal to 60 degrees, bisectors AD and CE of angle BAC and angle BCA intersect at point O, point F is on AC, and AF is equal to AE, connecting of
Prove that OD equals OE equals of

It is proved that because of the bisector ad of ∠ BAC, the bisector AD and CE of ∠ BAC and ∠ BCA, and because AE = AF, Ao = Ao, so △ AEO ≌ △ AFO, so of = OE, AOE = ∠ AOF, because of the bisector AD and CE of ∠ BAC and ∠ BCA, the bisector AD and CE of ∠ B = 60 ° so ∠ AOC = 120 ° so, AOE = ∠ cod = 60 °, AOE = ∠ AOF = 60 ° so ∠ FOC = ∠ a

As shown in the figure, in △ ABC, ab = AC, AC is the chord of ⊙ o, BC intersects ⊙ o at point D, making the bisector AE of ∠ BAC intersects ⊙ o at point E, connecting De

It is proved that: ∵ AB = AC, ∵ B = ∵ C, ∵ fac = ∵ B + ∵ C = 2 ∵ B, ∵ AE bisection ∵ fac, ∵ fac = 2 ∵ FAE = 2 ∵ EAC, ∵ FAE = ∵ B, ∵ AE ∥ BC, ∵ e = EDC,