If 0.25 × 4 = 1, then 0.25 and 4 are reciprocal, right or wrong?

If 0.25 × 4 = 1, then 0.25 and 4 are reciprocal, right or wrong?

That's right

Fill in the number of nine squares
Fill nine consecutive natural numbers 1-9 into the nine palace grid, so that the sum of the three numbers of all horizontal, vertical and diagonal angles is equal to 15

4,9,2
3,5,7
8,1,6

The problem of filling in the number of nine squares
This is a relatively old problem. Fill in nine numbers from 1 to 9 in the nine palace, so that the sum of horizontal, vertical and oblique will get 15. How to calculate

"In the middle of the upper row, fill in the diagonal one by one, and don't forget it. When you go up and out of the frame, put it down, and when you go right out, put it to the left. When you put the weight in the lower row, put it in the upper right row."
This formula not only applies to nine palaces, but also applies to the promotion of odd nine palaces, such as five five pictures, seven seven pictures and so on
The formula of Jiugongge calculation:
2、 Four for the shoulder, six, eight for the foot

Fill in the figures with nine squares
92*8
****92***
**2*7***3
**6**5*2*

How to fill in the figures in the nine square?

Do you mean "the meaning of the nine palaces is based on the spirit tortoise, with 24 shoulders, 68 feet, three on the left and seven on the right, wearing nine shoes and one in the middle?"?
Yes, that's right
4 9 2
3 5 7
8 1 6

The price of a fashion set is 800 yuan
Xiaoying's mother bought the dress at a price of 10 yuan more than 50% discount. At this time, the merchants are fighting for 25%. How much is the purchase price of the dress?

The price of the suit is x yuan
800×0.5+10=(1+25％)x
x=328
The price of the suit is 328 yuan

The original price of a garment is 800 yuan, but now it is reduced by 1 / 5, which is still 100 yuan higher than the purchase price. How much is the purchase price of this garment?

800×4/5-100

The original price of a dress is 500 yuan. How much is the current price after a 20% reduction?

=500X（1-3/20）=425

A dress, the original price of 500 yuan, the current price of 480 yuan, a few discount

480 / 500 = 0.96 for 96 discount, divide the selling price by the original price, and the decimal number is the discount. You need to master the method

The original price of a garment is 100 yuan, but now it is 85 yuan. How much is the decrease

(100-85)/100=15%