A certain green vegetable is produced in a certain place, and a certain green vegetable is grown in

Plan 1: The profit is 4500 140 = 630000 (yuan) Plan 2: 15 days can be finished 6 15 = 90 (tons), indicating that there are still 50 tons that need to be sold directly in the market, so the profit can be 7000 90 + 1000 50 = 680000 (yuan).

Scheme 3: X tons of vegetables can be set for fine processing, (140-x) tons for rough processing, according to the topic to get x 6 + (140-x) 16 = 15

The solution is x=60

Therefore, profit: 7000 60 + 4500 80 = 780000 (yuan) Therefore: choose option 3 to make the most profit

Answer: Option 3 is the most profitable

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Analysis: (1) There are three feasible schemes: all can be sold through rough processing, because 240 tons can be processed in 15 days; It can't be all finished, and only 90 tons can be processed in 15 days, so the scheme is:

Rough processing of all vegetables Finish as many vegetables as possible, and sell vegetables directly on the market if you don't have time to process them Some of the vegetables are finely processed and the rest of the vegetables are rough, and it is completed in exactly 15 days

2) Rough processing profit: 4000x140 = 560000 (yuan) As much as possible to fine the vegetables, there is no time to process the vegetables, directly sell in the market Profit: 15 6 7000 + (140-15 6) 1000 = 680000 (yuan) The tonnage of finishing and rough processing should be calculated first The answer can be derived from this Answer:

Solution: (1) Scheme 1: Rough processing of all vegetables;

Plan 2: Refine as many vegetables as possible, and sell vegetables directly on the market if they do not have time to be processed;

Plan 3: Finish some of the vegetables and rough the rest of the vegetables, and complete them in exactly 15 days

2) Plan 1: The profit is 4000x140=560000 (yuan).

Scheme 2: 15 days can be finished 6 15 = 90 (tons), indicating that there are still 50 tons that need to be sold directly in the market, so it can make a profit of 7000 90 + 1000 50 = 680000 yuan).

Scheme 3: x tons of vegetables can be set for fine processing, and (140-x) tons for rough processing, according to the topic.

The solution is x=60

Therefore, profit: 7500 60 + 4500 80 = 810000 (yuan).

Therefore, option 3 is the most profitable

Answer: Option 3 is the most profitable

Option 1.

Profit = 200*4 = 800 thousand yuan.

Option II. Machining = 8*16 = 128

Profit = 128 * 7 + 200 - 128) * = 1,000 RMB.

Option III. Let the number of days of finishing = x, then the number of days of roughing = 16 - x has: 8x + 16 - x) * 20 = 200 to get x = 10.

Finishing 10*8 = 80 tons, rough 200 - 80 = 120 tons.

Profit = 80*7 + 120*4 = 1040 thousand yuan.

Because 800 < 1040

Therefore, option 3 is the most profitable.

Solution: Plan 1: Profit is 4500 140 = 630000 (yuan) Plan 2: 15 days can be finished 6 15 = 90 (tons), indicating that there are 50 tons that need to be sold directly in the market, so you can make a profit 7500 90 + 1000 50 = 725000 (yuan) Plan 3: You can set x tons of vegetables for fine processing, (140-x) tons for rough processing, according to the topic.

The solution is x=60

Therefore, profit: 7500 60 + 4500 80 = 810000 (yuan) Therefore: choose option 3 to make the most profit

Answer: Option 3 is the most profitable

Plan 3 is more profitable.

Scheme 1: 140 x 4,500 = 630,000

Scheme 2: 15 * 6 = 80 80 * 7500 = 600000 (140-80) * 1000 = 60000 600000 + 60000 = 660000

Scheme 3: Set roughing x days 16 * x + 6 * (15-x) = 140 x = 5 days.

Finishing 15-5 = 10 days.

Plan 3 is more profitable.

Scheme 1: 140 x 4,500 = 630,000

Scheme 2: 15 * 6 = 90 (tons) (140-50) * 1000 = 90000 (yuan) 90 * 7500 + 90000 = 725000 (yuan).

Scheme 3: Set roughing x days 16 * x + 6 * (15-x) = 140 x = 5 days.

Finishing 15-5 = 10 days.

Scheme 1: 140 * 4500 = 63000 (yuan) Scheme 2: 15 * 6 = 90 (tons) (140-50) * 1000 = 90000 (yuan) 90 * 7500 + 90000 = 725000 (yuan).

Scheme 3: Solution: Set x days for finishing, 15-x days for rough machining.

6x+16(15-x)=140

6x+240-16x=140

10x = -100x =10

15-x15-10=5

The third type is the most profitable.

Solution: The profit of plan 1 is: 4500 140 = 630000 (yuan) The profit of plan 2 is: 7500 (6 15) + 1000 (140-6 15) = 675000 + 50000 = 725000 (yuan).

Let x days for rough machining and y days for fine machining, from the topic, x+y=15 16x+6y=140 solution: x=5 y=10

Therefore, the profit of plan 3 is: 7500 6 10 + 4500 16 5 = 810000 (yuan).

Since 810000 725000 630000, option 3 is the most profitable

Answer: Option 3 is the most profitable

Option 3: Rough processing of some vegetables and fine processing of the rest of the vegetables, and it takes exactly 15 days to complete.

Brothers, the equation for scheme three is x 6+140-x 16=1516x+840-6x=1440

10x=600

x=60 and then the ones above.

I wish you all the best in your studies!

(1) Solution: Let the functional relationship between the number of acres planted y and the amount of **subsidy x be y=kx+b, which can be seen from the image: (0,800),(50,1200), and substituting it:

Solution: k=8, b=800, y=8x+800

Answer: After the implementation of the subsidy policy, the functional relationship between the number of acres planted y and the subsidy amount x is y=8x+800

2) Solution: z=-3x+3 000, when x=0, z=3 000, total income: 3 000 800=2 400 000 yuan

A: Before the introduction of subsidy measures, the total income from the cultivation of this vegetable in the city was 2,400,000 yuan

3) Solution: w=yz, (8x+800) (-3x+3 000), -24(x-450)2+7 260 000, a=-24 0, the opening is downward, there is a maximum value, when x is set at 450 yuan, the maximum total income is 7260 000 yuan

Answer: In order to maximize the total income w (yuan) of this vegetable in the city, the amount of subsidy per mu should be set at 450 yuan, and the maximum value of total income w is 7 260 000 yuan

4）-24（x-450）2+7260 000=7 200 000，x1=400，x2=500．

Therefore, it is set at 400 yuan to 500 yuan

Answer: The subsidy amount per mu should be set at 400 yuan to 500 yuan, which is the most appropriate

In order to expand the scale of exports, the city decided to increase the scale of exports, and the city decided to increase the value of this vegetable for 1 y=8x+800 2 600*800=480000 3 (-3x+3000)*y=(-3x+3000)*(8x+

Plan 1: 20*16 > 200

Profit = 200*4 = 800 thousand yuan.

Scheme 2 processing = 8*16 = 128

Profit = 128 * 7 + 200 - 128) * = 1,000 yuan scheme 3 set the number of finishing days = x, then the roughing days = 16 - x has: 8x + 16 - x) * 20 = 200 solution x = 10.

Finishing 10*8 = 80 tons, roughing 200 - 80 = 120 tons, profit = 80*7 + 120*4 = 1040 thousand dollars, because 800 < 1040

Therefore, option 3 is the most profitable.

Plan 3 is more profitable.

Scheme 1: 140 x 4,500 = 630,000

Scheme 2: 15 * 6 = 80 80 * 7500 = 600000 (Zheng type with 140-80) shouting finger * 1000 = 60000 600000 + 60000 = 660000

Scheme 3: Set rough machining rental mold x days 16 * x + 6 * (15-x) = 140 x = 5 days.

Finishing 15-5 = 10 days.

Solution: The first plan: 4500 140 = 630000 (yuan) The second plan:

6 15 = 90 (tons) 140-90 = 50 (tons) 7500 90 = 675000 (tons) 1000 50 50000 (tons) 675000 + 50000 = 725000 (yuan) The third scheme is reformed: pin rough 10 6 = 60 (tons) 5 16 = 80 (tons) 60 + 80 = 140 (tons).

7500 60 = 450000 (yuan) 4500 80 = 360000 (yuan).

450,000 + 360,000 = 810,000 (yuan) Answer: The third option is the most profitable.

Profit of plan 1: 7500 90 + 1000 (140-90) = 10,000;

Profit from plan 2: 140 4500 = 630,000;

Plan 3: Profit reputation:

If the finishing is x tons, then the rough processing is (140-x) tons, x 6 + (140-x) 16 = 15, and the solution is: x = 60

It is verified that x=60 is the solution of the original Qing Zeyuan equation

7500 60 + 4500 (140-60) = 810,000 So option 3 has the most profits

Plan 3 is more profitable.

Scheme 1: 140 x 4,500 = 630,000

Scheme 2: 15 x 6 = 90 90 x 7500 = 675000 (140-90) x 1000 = 50000 675000 + 50000 = 725000

Scheme 3: Set roughing x days 16 * x + 6 * (15-x) = 140 x = 5 days.

Finishing 15-5 = 10 days.

Plan 1: Rough processing of 140 tons of vegetables, with a profit of 4,500 yuan per ton;

Plan 2: 15 days of finishing, processing 6t per day, profit of 7500 per ton; The remaining 50t is sold directly, with a profit of 1,000 yuan per ton;

Scheme 3: The equivalence relationship is: finishing days + roughing days = 15, finishing tons + roughing tons = 140

Solution: The profit of plan 1 is: 4500 140 = 630000 (yuan).

The profit of plan 2 is: 7500 (6 15) + 1000 (140-6 15) = 675000 + 50000 = 725000 (yuan).

Set x days for rough processing, Y days for fine processing, from the title, obtained.

x+y=15

16x+6y=140

Solution: {x=5.)

y=10, so the profit of plan 3 is: 7500 6 10 + 4500 16 5 = 810000 (yuan).

Since 810000 725000 630000, option 3 is the most profitable

Answer: Option 3 is the most profitable

Do it yourself, I hope to be able to 3q!

Option 3, this works better.

Plan 3 is more profitable.

Scheme 1: 140 x 4,500 = 630,000

Scheme 2: 15 * 6 = 80 80 * 7500 = 600000 (Zheng type with 140-80) shouting finger * 1000 = 60000 600000 + 60000 = 660000

Scheme 3: Set rough machining rental mold x days 16 * x + 6 * (15-x) = 140 x = 5 days.

Finishing 15-5 = 10 days.