Mathematical puzzles are solved, and mathematical puzzles are solved

Because ......The angles of the two small triangles are different.

The ratio of the red two right-angled sides is 3:8

The ratio of the green two right-angled sides is 2:5

So, the upper and lower two so-called triangles, the hypotenuses, are not actually straight, so they are not triangles at all.

The area is therefore not.

This is a visual error.

The area of the triangle below is indeed one block larger than the one block above.

Geometrically, if you draw a red triangle with two straight sides of 3:8, it is impossible to draw a green right triangle with two straight sides of 2:5 like the one shown in the picture.

In the same way, if you draw a green triangle with that proportion, you can't draw a red triangle with that proportion.

Suppose we draw a green triangle with two straight sides of 2:5, and the ratio of the straight sides of the red right triangle is: 8 16:

40 2:5 So the height should be a grid. The red right triangle in the big triangle below is only 3 squares high, which means that its area is smaller than the red triangle of the big triangle above, so the extra space area comes from the red right triangle.

The sum of three odd numbers cannot be equal to the even number 30, so there is no solution to this problem according to normal thinking.

But this problem can be solved by using 9 as 6.

This question is not a question done by brick families and good students.

It suggests that the above numbers can be reused, so the 2 in the sentence "only 2 percent of people can understand" can be used. So the answer is: 13+15+2=30!

(1) Calculation.

1 cos(atan(root(99)))2(2) calculation.

141 1232 * 5+6 * root number (14)).

There was a river, and on one side, there were 3 wolves and 3 sheep. Now I want to put them [a lot of them!] They are all transported across the river by boat, and only 2 animals can sit on a boat, and the requirements are: there must be more or equal sheep than wolves on each side, otherwise they will be eaten.

How? Two wolves first, one wolf back.

Two more wolves, one wolf back.

Two more sheep, one wolf and one sheep back.

Two more sheep, one wolf, two more wolves, one wolf.

Finally two wolves.

Xiao Ming and Xiao Hua bought 10 catties of honey and put it in a large bottle. To divide the honey equally, there are only two empty bottles, one for exactly 7 catties and the other for exactly 3 catties. How can honey be separated in the easiest way?

3 7 10 (bottle).

As long as the thief listens to the lecture seriously, the thief does the questions seriously, the thief corrects the wrong questions seriously, and the thief seriously reviews the wrong questions, the thief can do well in the test.