A few primary school math Olympiad fill in the blank questions, people who will help out!!

Let the yield per hectare be a, the number of hectares of sown area is b, and the total yield is a*b, and now b is reduced to 4 5b, then a should be increased to 5 4a, in order to ensure that the total amount remains unchanged, 5 4-1 = 1 4 = 25

Let two consecutive odd numbers be (2n+1) and (2n+3), so the sum of two odd numbers is (4n+4) and the difference between two odd numbers is 2

So the sum of two consecutive odd numbers multiplied by their difference is 8n+8=304, so n=37

So 2n+1=75; 2n+3=77

That is, these two consecutive odd numbers are 75 and 77

If A and B are both integers, it can only be that A is 0 and B is -182, so their sum is -182

The third root is the second one.

The third root is more than the second.

times the second root is 280 cm long.

The first one is 200 cm long.

The third one is 240 2 480 cm long.

The greatest common divisor of 200,240,480 is 40

A total of 200 40 240 40 480 40 23 segments can be cut off so that the first bag is x, then the second bag is 20-x

According to the title, it can be obtained:

x-1/11x+[(20-x)+1/11x]×1/11=20÷2...100/121x=90/11

.x = kilogram – second bag kilogram.

4.Each root is 350, 420, 700 cm long, and each section can be cut 70 cm.

There are 5 + 6 + 10 = 21 roots.

1.For a book manuscript, the typist typed 1 4 of the whole book on the first day, and the ratio of the number of pages typed on the second day to the number of pages typed on the first day was 6:5, and how many fractions of the manuscript were left unfinished?

The number of pages typed on the second day is the whole book: (1 4) (6 5) = 3 10 There is still 1-1 4-3 10 = 9 20 left in the manuscript of the bookThere are two bundles of wire length ratio is 7:

4. The first bundle is 18 meters, the second bundle is 6 meters, and the remaining wires are of equal length. How many meters was the first bundle of wire?

The length of each serving: (18-6) (7-4) = 4 (m) The original length of the first bundle of wire was 4 7 = 28 m.

3.When three people participate in the race, the speed ratio of A and B is 3:4, and the speed ratio of B and C is 2:3.

B is used as the standard amount.

The speed ratio of A and B is 3:4>> A:

B = 3:4 The velocity ratio of B and C is 2:3>> C: B = 3:2 = 6:4 A: B: C = 3:4:6

B is used as the standard amount.

B = 4).

Make the subtraction the largest and the minus minimum.

Mary = 16, George = 17, Alice = 24, Claire = 71 Stephen = 56

Because Mary + George = 33;Mary + Stephen = 72;

So Stephen George = 39

And because Stephen + George = 73

So Stephen is 56 years old and George is 17 years old.

Mary = 72 - Stephen = 16 years old.

Claire = 87 - Mary = 71 years old.

Alice = 95 - Claire = 24 years old.

Mary = 27;

George = 6;Alice = 35;

Claire = 60;

Stephen = 45;

George Stephen = 67;