I have a few very difficult elementary school math problems, please give me advice

Elementary school doesn't learn fractions, it's ......(The original formula is approximately equal to 13 10 100, so the integer part is 1).

The second question seems to be a problem with the conditions......

The third question, the total amount of repair, a, then A 50 per day, and B 60 a day. Set B took a break for x days.

Quantity relationship: A did not rest, so A repaired for 30 days, and the workload was: (A 50) * 30 B rested for x days, so repaired (30-x) days, and the workload was: (A 60) * (30-x).

The sum of the workloads is a.

Therefore, the equation of the column: (a 50)*30+(a 60)*(30-x)=a, both sides of a are reduced to a, and the solution is x=6 (days) Answer: ......

Question 4: Half of the diagonal of the square is the radius: r=4 (root number2) (cm), and the area of the circle is square by r.

S circle = 8 factions, square S positive = 4 squares, subtract: S leftover = 8 factions - 4 (cm 2).

Problem 1: (The denominator is 100+78, and the numerator is 112x10=1120 178) so the integer.

Part is 1. Question 2: Last = 888 and 8/9 (m) Question 3: [(1 50 + 1 60) x 30-1] Divide by 1 6011 10 by 1 60

6 (day) Question 4: 4x4 - (4 divided by 2) square centimeters).

Question 3: 1-1 50*30=2 5 This is how much B has done for the whole project.

2 5 1 60 = 24 days of B's work.

30-24=6 B rests for a few days.

Final question. The radius of the circle is.

1.Think of it this way: the original ticket was 15 yuan, and 1 ticket was sold; Sell 2 tickets after the price reduction, and increase your income by 20%.(15% of 120% is 18).

18 2 = 9 (yuan).

2.The method is difficult. The ratio of the amount of money spent this month is 2x:x

2x+2000):(x+3000)=3:2 The solution is x=5000That is, the ratio of the amount of money spent in the mountain is 10,000 yuan and 5,000 yuan.

This month, Master Wang's or rent-only income is 2,000 + 10,000 = 12,000 yuan.

3.The number of the first group is compared to the number of the second group.

1, the clan ordered to set up a drop x total number of people in the mega cover is 1,15-x)*2-15= 15x20%.

15-2x= 3

x=6 is six dollars.

2, set the king's income x, then Su's income 2 3x; If the king spends y, then Su spends 1 2y.

x-y=2000.

2/3x-1/2y=3000

x=12000

3, It's a bit difficult to simplify the limbs, let the old man think about it.

Solution: Price reduction by X yuan.

15 (1+20 100)=(15-x) 2 solution x = 6 yuan before the reserve.

Solve the feast: The number of the first group is x. The number of the second group is y.

Solution x rollover y=182 78

This is an elementary school topic, so difficult.

4,9,(20),43,(90),185

If you don't understand, you can ask.

If it helps, remember to adopt, thank you Good luck learning!