The ratio of diagonal length to side length of square is (), and the ratio of height to side length of isosceles right triangle is ()

The ratio of diagonal length to side length of square is (), and the ratio of height to side length of isosceles right triangle is ()

The ratio of diagonal length to side length of square is (√ 2:1), and the ratio of height to side length of isosceles right triangle is (1:2)

It is known that the lengths of two sides of a right triangle are 1 and 2.5, respectively, and the lengths of the other side,

If both sides are right angles, the length of the other side is: √ (1 + 2.5 × 2.5) = √ 7.25;
If the two sides are an oblique side and a right angle side, the length of the other side is: √ (2.5 × 2.5-1) = √ 5.25

It is known that one side of a right triangle is 7.8 meters long, and the other side is 4 meters long?
Sincere help, thank you very much
Find the detailed calculation method of hypotenuse, thank you.

According to the Pythagorean theorem, because the square of the hypotenuse = the sum of the squares of two right angle sides
So square of hypotenuse = 7.8 square + 4 square = 76.84
Hypotenuse = 76.84 under root

How to cut paper with scissors

1. Fold the rectangular paper along the long side. 2. Adjust the position of the paper and put the layered side on the outside. 3. Draw the outline of the scissors with a pencil. Tips: children can draw the outline with a pencil to facilitate modification

Cut a large cuboid 16 cm long, 6 cm wide and 8 cm high into two small cuboids. What is the maximum and minimum sum of the surface areas of the two cuboids?

The surface area of the original cuboid: (16 × 6 + 16 × 8 + 6 × 8) × 2, = 272 × 2, = 544 (square centimeter), (1) after dividing into two identical cuboids, the maximum surface area is: 544 + 16 × 8 × 2, = 544 + 256, = 800 (square centimeter), (2) the minimum surface area is: 544 + 6 × 8 × 2, = 544 + 96, = 640 (square centimeter), a: the maximum sum of the surface areas of the two identical cuboids is 800 Square centimeter, the minimum is 640 square centimeter

How to fill in the blanks in primary school texts?
The tour route of Emei Mountain is (). How many stone slabs does it take to pave such a long road? Tens of thousands, hundreds of thousands, or millions? Aren't these countless stone slabs carried on their backs one by one like this? Mountain roads can't be used (), only by (). Thinking of this, my heart (), we walk on the road paved by others (), and the pavers, (), So day after day, year after year, they silently (), (), all for (). If not (), no (), no (), no (), no (), no (), no ()

Emei Mountain is just a tourist route (more than 200 Li). How many stone slabs does it take to pave such a long road? Tens of thousands, hundreds of thousands, or millions? These countless stone slabs are all carried up the mountain one by one like this. The mountain road is so narrow that it can't be used (mechanically), only by (manually). Thinking of this, I feel a sense of guilt in my heart. It's hard for us to walk on the road paved by others, while the road pavers (carry stones up the mountain) and (pave the road). Day after day and year after year, they silently (suffer a lot) and (sweat a lot) for the convenience of others, There will be no (the stone stairs), no (the road at the foot), and no (the joy of tourists)

What is the basis for the deformation of formula 5x (- 2) = (- 2) X5?
Although there is no reward, it is also a pleasure to help others
(((- 8) * (- 0.125)) * 20 = the number obtained is 20 (1 / 2-1 / 3 + 1 / 6) X6 multiplied by the distribution rate
(- 6 / 5 and 15) X12 simple method

First, a times - B = - B times a, commutative law of multiplication
The second question, 8 times 125 = 1000, this is commonly used, two negative numbers multiply to get a positive number, three decimals and 1000 offset, get 20
The third question, 1 / 2 times 6 minus 1 / 3 times 6 plus 1 / 6 times 6 equals 2

There are 400 science and technology books in the library, 38 less than story books. How many story books are there?

A: there are 640 story books

If A=810×811×812×… ×2010×2011810nis a positive interger，then the maximum value of positive interger n is______ ．

Let y = 810 × 811 × 812 × 813 × 814 × X 2009 × 2010 × 2011, the factor of 2 and 5 in Y is enough, that is to find the number of factors of 3, there are 2011-810 + 1 = 1202, the multiple of ∵ 3: 12023 = 400 2401, multiple of 9: 12029 = 133 5134, multiples of 27: 120227 = 44 14, 45, multiple of 81: 120281 = 14 68… 15, the multiples of 243: 5, the multiples of 729: 2, the multiples of 2187: 0, the number of factors of 3 = 401 + 134 + 45 + 15 + 5 + 2 = 602, the number of factors of 810n has 4N 3, the number of factors of 602 △ 4 = 150 The maximum value of 2n is 150

There are more than 1000 kilometers of rivers in China

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