7th grade math problems, find master ideas Answers!!

Option 1 is more profitable. Because 2 tons of milk tablets can be processed in one day, 8 tons can be processed in 4 days, and the remaining 1 ton is directly sold fresh milk

2000 4 2 + 500 = 16500 (yuan) and the second plan can be profitable: processing tablets for 3 days, processing 2 tons per day, processing yogurt on the fourth day, processing 3 tons a day:

2000 3 2+1200 3=15600 (yuan) 16500 15600 So plan 1 is more profitable.

Solution: Try the first option.

The profit obtained from making milk tablets within the effective time is: 2 4 2000 = 16000 (yuan) Profit from selling the remaining milk: (9-4) 500 = 2500 (yuan) Total profit:

16000 + 2500 = 18500 (yuan) plan 2. The profit is the highest.

One day: The profit of early milk tablets within the effective time is: 2 1 2000 = 4000 (yuan) yogurt:

3 (4-1) 1200 = 10800 (yuan) Total profit: 4000 + 10800 = 14800 (yuan) Like this, look for it later.

The total profit in the second day was 15,200 yuan.

The total profit in three days was 13,200 yuan.

The total profit in four days is 16,000 yuan.

Therefore, option 1 is the most profitable.

One: Make as many milk tablets as possible, and sell the rest directly fresh milk.

Eight tonnes of milk tablets were processed in four days.

The profit is 8 * 2000 + (9-8) * 500 = 16500 two: part of the milk is made into milk tablets, and the rest is made into yogurt for sale.

The first 3 days are processed 6 tons of milk flakes, and the day is 3 tons of yogurt.

The profit is 6 * 2000 + 3 * 1200 = 15600, and plan 1 has more profits.

Assuming that the length of the rope around the earth is a and the radius of the earth is r1, then 2 r1 = a --1

The length of the rope around the orange is b, and the radius of the orange is r2, then 2 r2=b --2

Now increase A by one meter and set the new radius to R1', there is 2 r1'=a+1 --3

Now increase b by one meter and set the new radius to r2', there is 2 r2'=b+1 --4

The void created by the earth is r1'-r1, the void created by the orange is r2'-r2

Subtract 1 from 3 to get 2 (r1'-r1)=1

Subtract 2 from 4 to get 2 (r2'-r2)=1

Because 2 is a fixed value, r1'-r1=r2'-r2

Conclusion: The gap between the earth and the rope, the gap between the orange and the rope is the same.

The Wolf Hunter team will answer for you.

Let the radius of the earth be r, and the so-called void is the radius difference after the circumference is added to 1 meter

The circumference of the earth is 2 r, and the radius after the circumference is added to 1 m: (2 r+1) 2 = r+1 (2 ) r + m.

The void has 1 (2) (or about meters.

Let the radius of citrus be r, the circumference of citrus is 2 r, and the radius after adding 1 meter to the circumference is:

2 r+1) 2 = r+1 (2 ) r+m.

i.e. there are the same gaps.

The distance between the two is the same, because the orange and the earth were just wrapped around the rope before, and with the addition of a meter of rope, both the orange and the earth are also one meter more, and both are the same meters above the surface.

The same size because the circumference of the circle = 2 radius, so the void of the earth = [(2 radius of the earth+1) 2 ] - radius of the earth = (2 radius of the earth + 1-2 radius of the earth) 2 = 1 (2 ).

Orange void = [(2 orange radius + 1) 2 ] - orange radius = (2 orange radius + 1-2 orange radius) 2 = 1 (2 ).

It's a question of a big circle and a small circle, the circumference is increased by one meter, and ask whose radius has increased much.

The perimeter is 2 pi r and 2 pi r, and if r is increased by one meter, it is equivalent to an increase of 1 2pi in their radii, and their area is increased by pi[(r+1 2pi)(r+1 2pi)-r*r], and pi[(r+1 2pi)(r+1 2pi)-r*r].

Didn't understand what you meant. Whether the ropes can be wrapped on top of each other or not. If it overlaps, the distance between the earth and the orange and the rope will be the diameter of the rope.

If it weren't for the overlap, the circumference of the oranges would not have been one meter. The rope also left the orange, and the distance was huge.

With oranges, the circumference of the orange should be too small, and the radius of the circle formed by adding a meter of rope will increase several times

(1) 0 (2) 0 (3) - 10 (4) 13 (5) 14 (7) 291 (8) 147 (9) - 51 (15) (10) 101 (11) - 2 (12) 567 (13) 89 (14) 336 per 5

How many chats do you qq send over.

>k(x+3)

3+kx-2k-4x>kx+3k

4x<3-5k

x is a negative number. Therefore x<0, 4x<0

then 0>=3-5k

k>=3/5

2.Set up for $x.

60x≥940×115%

The solution to x is that because x requires accuracy to the yuan, the integer is taken as:

x 19 A: The price of each of these goods should not be less than 19 yuan.

1+1+（-1）＝1

So there are ABCs and negatives.

ABC is negative.

The absolute value of abc is positive.

So it's -1