Solution equation: 21x = 35-8

Solution equation: 21x = 35-8

21X=35\8
Then x = 35 △ 8 △ 21
So x = 5 / 24

During the promotion period of a shopping mall, it is stipulated that: all goods in the shopping mall are sold at 80% of the price; at the same time, when customers spend a certain amount in the shopping mall, they can also get the corresponding amount of lottery tickets according to the following scheme: consumption amount a (yuan) 200 ≤ a < 400 ≤ a < 500 ≤ a < 700 700 ≤ a < 900 The amount of lottery ticket is 30 60 100 130 yuan According to the above promotion methods, customers can get double discounts when shopping in the mall. For example, if they buy a commodity with a price of 400 yuan, the consumption amount is 320 yuan, and the discount amount is 400 × (1-80%) + 30 = 110 yuan. The discount rate for purchasing a commodity = the discount amount for purchasing a commodity △ the price of the commodity What's the discount rate? (2) For goods priced between 500 yuan and 800 yuan (including 500 yuan and 800 yuan), how many yuan can customers get a discount rate of 13?

(1) Discount amount: 1000 × (1-80%) + 130 = 330 (yuan) discount rate: 3301000 × 100% = 33%; (2) if the price is set at x yuan, you can get 13 discount rate. When the price is between 500 yuan and 800 yuan, the consumption amount a is between 400 yuan and 640 yuan

How many square meters is one cent of land

One land = 66.7 square meters

The solution equation: (A-8) (A-15) = 144

a²－23a－24＝0
（a－24）（a＋1）＝0
a1＝24,a2＝－1.

During the promotion period of a shopping mall, it is stipulated that all goods in the shopping mall are sold at 80% of the price. At the same time, when customers spend a certain amount of money in the shopping mall, they can get the corresponding amount of lottery tickets according to the following scheme. (lottery shopping no longer enjoys preferential treatment) the range of consumption amount x (yuan) is 200 ≤ x < 400400 ≤ x < 500500 ≤ x < 700 The amount of lottery ticket (yuan) 3060100 According to the above promotion methods, customers can get double discounts when shopping in the mall. If Mr. Hu buys goods priced at 450 yuan in the mall, he will get a discount of______ Yuan

The preferential amount of Mr. Hu is 450 × (1-80%) + 30 = 120 yuan, so fill in "120"

How many meters per mu

1 mu = 666.7 square meters, the side length of the square = 25.82 meters

Solution equation: 2 (X-8) = 15.2

2（X-8）=15.2
2x=15.2+16
2x=31.2
x=15.6
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During the promotion period of a shopping mall, it is stipulated that all goods in the shopping mall are sold at 80% of the price; at the same time, when customers spend a certain amount of money in the shopping mall, they can get the corresponding amount of lottery tickets according to the following scheme: the range of consumption amount (yuan) [188388] (388588] (588888] (8881188] The amount of lottery ticket is 28 58 88 128 yuan According to the above promotion methods, customers can get double discounts when shopping in the mall. For example, if they buy a commodity with a price of 400 yuan, the consumption amount is 320 yuan, and then they can get the corresponding lottery amount of 28 yuan. Therefore, the discount amount that the customer gets is: 400 × 0.2 + 28 = 108 yuan. Suppose that the discount rate that the customer gets from purchasing the commodity is the discount amount that the customer gets from purchasing the commodity, and the price of the commodity (1) what is the discount rate for a product priced at 1000 yuan? (2) When the price of the goods is [100600] yuan, try to write the functional relationship between the discount rate y and the price X; (3) when the customer purchases the goods whose price is not more than 600 yuan, can the customer get more than 35% discount rate? If you can, please give an example; if not, try to explain your reasons

(1) According to the meaning of the title, the consumption amount of 1000 yuan is 1000 × 0.8 = 800 yuan, so the preferential amount is 1000 × 0.2 + 88 = 288 yuan, and the preferential rate is 2881000 = 28.8%. (2) according to the meaning of the title, when the consumption amount is 188 yuan, the price is 235 yuan; when the consumption amount is 388 yuan, the price is 485 yuan

How many meters is a decimeter

0.1 M 1 m equals 10 decimeters equals 100 cm = 1000 mm

2x △ 3 / 4 = 7 / 15 to solve the equation

2x=7/15×3/4
x=7/20÷2
x=7/40