It takes 20 days to transport a pile of soil. If you transport 30 vehicles a day, you need to complete the task five days in advance. How many vehicles do you need to transport every day?

It takes 20 days to transport a pile of soil. If you transport 30 vehicles a day, you need to complete the task five days in advance. How many vehicles do you need to transport every day?

30 × 20 (20-5) = 600 △ 15 = 40 (cars); answer: 40 cars are transported every day

It takes 20 days to transport a pile of soil. If you transport 30 vehicles a day, you need to complete the task five days in advance. How many vehicles do you need to transport every day?

30 × 20 (20-5) = 600 △ 15 = 40 (cars); answer: 40 cars are transported every day

If x ≠ 0, then the function y = 4-6 / x ^ 2-3x ^ 2 has
The maximum value is 4-6 √ 2

X ≠ 0, x ^ 2 > 06 / x ^ 2 + 3x ^ 2 is constant > 0. From the mean inequality, we get 6 / x ^ 2 + 3x ^ 2 ≥ 2 √ (6 × 3) = 6 √ 2. When 6 / x ^ 2 = 3x ^ 2, that is, when x ^ 2 = √ 2, we take the equal sign

Find the minimum value of y = 6 / x ^ 2 + 3x ^ 2

One of the most basic problems in senior high school, which can be solved as y = 3 (2 + x ^ 2) / x ^ 2 in the college entrance examination, when x tends to infinity, the minimum value of Y is 3. I don't know if it's correct. I've been away from senior high school for nearly six years, and I'm going to solve it with my study that year