Math problems, please master answer, math problem solving, master please enter

1 9000000 = 117000000cm = 1170km m = 3000 cm, 20 m = 2000 cm.

Above: length = 3000 1 1000 = 3 cm, width = 2000 1 1000 = 2 cm.

3. Actual distance = 8 1: 200000000 = 160000000 cm = 1600 km.

1600 600 = 2 and 2 3 hours.

A: It takes 2 and 2 to 3 hours to arrive.

1: 9000000 = 13 cm: x, x = 117000000cm = 1170km

Length = 30 m * 1/1000 = 3cm Width = 20 m * 1/1000 = 2cm

The actual distance between the airports of A and B is 8 cm (1:20000000) = 1600km, 1600 600 = 8 3 hours.

13 * 9000000 = 117000000 cm = 1170 km.

30 1000 = m = 3 cm.

20 1000 = m = 2 cm.

8 * 20000000 = 160000000 cm = 1600 km.

1600 600 = 2 and 2 3, i.e. 2 hours and 40 minutes to arrive.

On a map with a scale of 1:9000000, the distance between A and B is 13 centimeters, how many kilometers is the actual distance between A and B?

1:9000000=13：x

x = 117000000 cm = 1170 km.

The actual distance between A and B is 1,170 km.

The basketball court is 30 meters long and 20 meters wide, and how many centimeters should be drawn on a drawing with a scale of 1/1000 scale?

Length = 3000 1000 = 3 cm.

Width = 2000 1000 = 2 cm.

On the map of sub 1:20000000, the distance between the airports of A and B is 8 cm A famous technology flies from Airport A to Airport B at a speed of 600 kilometers per hour, and it takes several hours to arrive?

It takes about an hour to arrive.

1) 13cm*9000000=117000000cm=1170km

2) The length is 30m*1 1000=3cm, and the width is 20m*1 1000=2cm

3) The actual distance is 8*20000000=16000000cm=1600km, and the time is 1600 600=8 3 hours is approximately equal to hours.

Let pq=qr=rs=unit 1

Then s1 = area of the great circle - area of the middle circle = *3 2 - 2 2 = 5

s2 = area of the middle circle - area of the minor circle = *2 2 - 1 2 = 3

Hence s2 s1 = 3 5 = 3 5

How is S2 a ring and an area?

Let's say that the radius of the great circle is r, the minimum radius of the circle is r, and the relation r=3r is satisfied, then it is fine.

Let pq=qr=rs=a, then ps=3a, pr=2a, so s1=(3a) 2 -2a) 2 =5a 2 in the same way s2=(2a) 2 -a 2=3a 2 so s2 s1=3 5 i.e. three-fifths.

Got it?

A 43, B 24

Let the age difference between A and B be x

Then 5+x is the age of B, and 62-x is the age of A (62-x) -5+x) = x

57 - 2x = x

x = 19

62-x=43

x+5=24

Let A's age be x and B's age be y

x-y=y-5

y-x=x-62

Solution: x=43, y=24

Let A be x years old, B y years old, and the equation is:

2×y-x=5

2*x-y=62

In the end, A is 43 years old and B is 24 years old.

The principle is that the sum of the sections is as close as possible, so that it is the most economical.

1), 10 roots, 10 left, 5 pieces.

3 pieces, 3 roots, 1 left, 2 pieces, 1 root.

There are 14 sticks in common.

2), 5 are needed, 20, 15, 5 are left.

5 are needed, 15 are left, 10 are left.

3 pieces, 5 roots, and the remaining 5 pieces, 2 roots.

There are 17 in total.

1.roots of wood, cut 10 each)

Roots of wood, of 9 roots, of 3 roots).

Roots of wood, of 1 root, of 2 roots).

Total required: 10 + 3 + 1 = 14 roots.

2.1+ sticks of wood, 1 m and 5 of each).

Root wood4 of each cut 5 roots)

roots of wood, of 15 roots, of 5 roots).

Roots of wood, of 5 roots)

Total required: 5+5+5+2=17.

.4+, 10 needed, 10 left, 5.

3 pieces, 3 roots, 1 left, 2 pieces, 1 root.

There are 14 sticks in common.

8+1=,,5 left, 20 left, 15, 5, 5, 15 left, 10 left.

3 pieces, 5 roots, and the remaining 5 pieces, 2 roots.

There are 17 in total.

What grade are you in?

If this is a college operations research problem, it's just a practice problem.

If you're a high school or just a junior high school student, it's complicated. It's a lot of computation.

No matter how you cut this, you will have leftovers of rice, because your selection of materials is even. Your timber is long meters You cut 3 meters of 1 rice leftovers.

This is this year's junior high school math contest question, but you copied the wrong question.

For any real number x,y,z, define the operation "*is: x*y=(3x 3y+3x 2y 2+xy 3+45) [(x+1) 3+(y+1) 3-60], and x*y*z=(x*y)*z, then 2013*2012*......3*2=？

Solution: When y=3, x*3=(9x 3+27x 2+27x+45) (x 3+3x 2+3x+5)=9, so the original formula=9*2=(4374+1083+72+45) (1000+27-60)=5574 967.

Is that okay?

1,3 packets of chocolate:

That is, each pack of chocolate chips is yuan.

That is, from day 4 onwards, read at least 29 pages a day.

Kilogram = 2750 grams.

That is, Director Zhang needs kilograms of this oil, which should be 990 yuan.

1；The price of each pack of Shanghaojia is yuan, and each package of chocolate beans is yuan.

2；(150-5) (8-3) = 29 pages.

3；500+ grams.

Kilogram = 2750 grams.

198*5=990 yuan.