Elementary school math problems, how many can you make

1.Correct a previous mistake.

The period of the first question should be: red, white, yellow, green, red, white, yellow, green, ......The cycle should be 4.

It should be: 180 4=45 (pcs).

A: The 180th light is a red light.

......2 (days).

A: 2009 but Thursday.

The period is 012345679

2000 9 = 222 (pcs) ......2 (pcs).

Answer: The 2000th number is 1.

4.According to: Number of Items = (Last Item - First Term) Tolerance +1. formula.

You can write the equation: (90-30) 2+1

31 (row) After getting the number of items, you can list the equation:

1860 (pcs).

A: The theater has a total of 1,860 seats.

5.What is a decimal point???

It's 0. 105-100 = 5 (number).

Your family lives on the 5th. Next time I come to your house to play.

7.The first lock should be tried 9 times.

The second lock should be tried 8 times.

The third lock should be tried 7 times.

The 4th lock should be tried 6 times.

The 5th lock should be tried 5 times.

The 6th lock should be tried 4 times.

The 7th lock should be tried 3 times.

The 8th lock should be tried 2 times.

Don't try the last lock.

Therefore, you can list the equations:

9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 = 44 (times), so you only need to try 44 times.

If you try more, you'll suffer.

I'm done.

Red light. Wednesday.

2000/9=222……2 The 2000th is 81811 3 = 603 ......2 99 + 603 = 702 703 The second digit: 0

14+1=15 There are 15. Your family is No. 14 (the second one is a make-up) I am in the fifth grade, and I am studying Olympiad mathematics, and I will be in the third or fourth grade.

1: 180 4=45, Answer: It is green because there is no remainder.

2: Wednesday.

3: 1 81= Answer: Yes 1

4: There are 90-(30-1) 2=32 seats in the first row, and there are (32+90) 30 2=1830 seats.

The others are the same as the second floor.

Red light. Wednesday.

2000/9=222……2 The 2000th is 81811 3 = 603 ......2 99 + 603 = 702 703 The second digit: 0

6。There are 101 in total, and my house is the 56th.

7。[10-1]*10 2=45 [times].

Divide by 5=36 red.

Divide by 7 = 52 ......2: Wednesday.

These topics are so simple that I don't even want to think about them, and I will think about them later.

1.Red light 2Wednesday 3The 2000th is 8 without writing the process.

That should work.

Please, add more points.

1.Green light. 2.Wednesday.

I definitely don't have to try it the last time.

1. Green. 2, Thursday.

6, fifteen families My family is 10

2 = 144.

2. (1) If the two engineering teams work together to complete 1 3 of all the projects in 4 days, and Team B completes the 1 4 of the remaining projects (i.e. 2 3 of all projects) in 5 days, that is, 1 6 of all projects, then Team B can complete 1 30 (i.e. 1 6) of all projects every day

2) Because the two engineering teams can complete 1 3 of all the projects in 4 days, that is, the two teams can complete 1 12 per day by cooperating, subtracting 1 30 per day from team B, and it can be seen that team A can complete 1 20 of all projects per day.

3) (1-1 3) (1-1 4) 1 2, that is, the part completed by the last two teams is 1 2 of the whole project, because the two teams can complete 1 12 per day, it can be seen that the number of days for the two teams to cooperate again is 6 days.

4) Team A worked for 4+6 10 days, and Team B worked for 4+5+6 15 days, multiplied by the progress of the two teams every day, then Team A completed 10 1 20 1 2, and Team B completed 15 1 30 1 2, that is, 1 2 of the two teams completed all the projects.

Therefore, each of the two teams should share 1 2 of the contract fee of 21,000 yuan, that is, 10,500 yuan.

3. Reduced tickets** (1+1 5) 50 (1+1 2) 40 yuan. That is, the price of each ticket has been reduced by 10 yuan.

1.(One-third) of a ton is (one-third) of (one-third) and (five-sixths) of a five-ton is (twenty-five sixths) of a ton.

Three tenths less than 80 and more than 50 (60).

3.(two-fifths) plus (one-quarter) divided by (three-quarters) of the quotient, and the resulting sum is multiplied by (one-quarter), and the product is thirteen sixtieths.

4.8 times the sum of a number equals 74 to 60, and this number is.

Divide (45/4) quotient, add 2 minus (three-quarters) the difference, and the sum is 2.

5.(one-half) ton of rapeseed can be squeezed (one-fifth) of the oil, and the oil yield of rapeseed is 40 percent. To fry 1 ton of rapeseed oil, you need 2500 tons of rapeseed.

6.The cargo center transports 150 tons of cargo per day, and 6 days is exactly 3/8 of all the cargo, and there are 1,500 tons of cargo left in the cargo center.

1st cell 1

2nd square, 2rd square, 3rd square, 2*2=2, 2=4

4th cell 2*2*2=2 3=8::

The nth box is 2*2*.2 (n-1 2) = 2 (n-1) then 64 cells are 63 2s multiplied.

This is a difficult topic for elementary school!

4 grids 8 5 grids 16 6 grids 32 7 grids 64 8 grids 128... Is this a primary school question?

The first case: is 2 o=1

2nd case: 2 1=2

Then 64 is 2 63