A bottle of mineral water is about 500 (); a bottle of eye drops is about 10 (); the volume of freight container is about 5 ()

A bottle of mineral water is about 500 (); a bottle of eye drops is about 10 (); the volume of freight container is about 5 ()

A bottle of mineral water is about 500 ml; a bottle of eye drops is about 10 g; the volume of freight container is about 5 m3

Application: the volume of a bottle of mineral water is 500ml, try to find the gravity of this bottle of mineral water, Newton patiently answer!

Water volume: V water = 500ml = 0.0005m & # 179; according to: ρ = m / V mass: M = ρ v = 10 × 10 & # 179; × 0.0005m & # 179; = 0.5kg, the gravity of water is: g = mg = 0.5kg × 9.8n/kg = 4.9n, if G = 10N / kg, the calculated gravity is: 5N (generally speaking, if not

180 cases of sprite from a large supermarket, a quarter less than cola. How many cases of cola

If you have X cases of coke, you can get the following formula
X-1/4X=180
180=1-1/4X
180=3/4X
X=180÷3/4
X=240

Mineral water, pure water and boiled water

Pure water is just water, good minerals and substances harmful to human body are all filtered, that is, there is no beneficial help to human body, only thirst quenching mineral water contains minerals needed by human body, and those harmful substances are filtered out

Comparison: mineral water, purified water, tap water, distilled water, boiled water

The concentration of mineral ions is different,
Distilled water is obtained by distillation process, and its content is very low
Pure water is through lower distillation, filtering most of the mineral components
There are also a lot of minerals in mineral water, which are obtained from mountain spring after preliminary filtration
Boiled water is the water you get after the boiling process
Tap water refers to the water obtained after a simple sedimentation process

The price of Wahaha mineral water is 1.2 yuan per bottle. At present, a supermarket and B supermarket give preferential policies respectively. A supermarket gives 10% discount for all bottles and B supermarket gives 20% discount for more than 20 bottles. If you are a consumer, which supermarket is more suitable?
Using inequality

Wahaha mineral water is priced at 1.2 yuan per bottle. Now a supermarket and B supermarket give preferential policies respectively. A supermarket gives 10% discount for all bottles and B supermarket gives 8% discount for more than 20 bottles

The price of a bottle of mineral water is 1.2 yuan. Now the two shopping malls give preferential policies: 10% off for all the bottles in shopping mall a and 20% off for the bottles in shopping mall B. If you are a consumer, which shopping mall is more cost-effective?

When x is more than 20, the total price is 0.9 × 1.2x = 1.08x
The total price of shopping mall B is 1.2 × 20 + 1.2 × 0.8 × (x-20) = 0.96x + 4.8
Let 1.08x ≤ 0.96x + 4.8 get x ≤ 40
That is, when the number of bottles purchased is less than 40, choose a, when more than 40, choose B, when equal to 40

The price of Wahaha mineral water is 1.5 yuan per bottle. At present, a and B shopping malls offer preferential policies: 10% off for all of a shopping malls and 20% off for more than 20 bottles of B shopping malls. The teacher asked Xiao Ming to buy some mineral water. Xiao Ming thought about it and thought it was more favorable to buy it in B shopping malls
A. x＞20B. x＞40C. x≥40D. x＜40

Obviously, if you buy less than 20 bottles, shopping mall a is more favorable. If you buy more than 20 bottles, shopping mall B is more favorable than shopping mall a when consumers buy x bottles of mineral water

Students go to spring outing and divide 42 bottles of mineral water and 30 bottles of coke equally into several groups. After that, how many groups can they be divided at most? How many bottles of each of the two drinks are given to each group?

The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42. The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30. The greatest common factors of 42 and 30 are: 6.42 △ 6 = 7 (bottles), 30 △ 6 = 5 (bottles)

As you know, every can of coke costs a yuan, every can of coke costs 0.5 yuan more. The price of a bottle of mineral water is half that of a can of coke. How much did Xiaohua spend on two cans of coke, one can of milk and five cans of water

2 cans of coke = 2 a can of fruit milk = a-0.5 a bottle of mineral water = A / 2
So, the total is:
2a+(a-0.5)+5（a/2）
=3a-0.5+(5/2)a
=5 (1 / 2) a-0.5 (yuan)