Can anyone give me an Odyschia? Can anyone tell me how to do this Olympiad

Uncle Wang and Xiao Ming played such a game, dividing the following 8 numbers into two groups equally, so that the product of each number in the two groups was equal.

Solution: 14 = 2 7 30 = 2 3 5 33 = 3 11

Thus it gets:

Solution: If you reverse the position of the numerator and the denominator, then question (1) should look like this:

Question (2) should look like this:

The nth item is: 1+2+. n)/(n+1)

n(n+1)/2(n+1)

n 2 original = (1 + 2 + 3 + .59)/2

Did you misplace the numerator and denominator?

No, the time spent walking is equal to the time spent on the bike, and the time spent riding the bike is the time spent more than the time spent on the bike.

Let the whole journey be s, the bicycle speed is v, and the bicycle time = s v. Half-walk time: (s 2) (v 2) = s v.

If the cycling speed is 1, the riding speed is 4 and the walking speed is 1 2

A: Taotao can't get home earlier than usual.

Let the cycling speed be x and the distance is y

It takes time to ride a bicycle = y x

Time required after the bicycle is broken = (y 2 4x) + (y 2 x 2) = y 8x + y x = 9 8 y x y x

So can't get home earlier than usual.

, my mother is 30 years older than Yaya, and now Yaya is 50 years old, so my mother is 80 years old this year.

Avan is 10 years older than Ada, now Ada is 30 years old, and Avan is now 40 years old.

4, Tong Tong is 12 years younger than Linlin, and Linlin is (48-12=36) years old this year.

A and B walked in the same direction from place A and place B at the same time. As shown in the figure, the two line segments l1 and l2 represent the functional relationship between the distance of A and B from place A y (km) and line x (h) respectively, where the analytic formula of l1 is y=4x.

1) Find the analytic formula of the function of l2.

2) Find the distance between A and B and get away from place A.

3) If the two of them carry an infinite walkie-talkie, and the effective distance between the walkie-talkies is not more than 1km, find the value range of the time x they can talk to each other?

1. The volume of a cylinder and a cone is equal, the ratio of the height of the cylinder to the height of the cone is 4:9, the bottom area of the cone is 20 square centimeters, and the bottom area of the cylinder is how many square centimeters?

2. There is a section of rectangular iron block with a length of 4 cm and a width of 3 cm in a cylindrical bucket immersed in water, and the water surface rises by 8 cm.

The length of the three sides of the triangle ABC is a, b, and c satisfies a+b+c=1, and the verification is: 5 (a square + b square + c square) + 18abc 7 3