Help with math, The purchase price of a commodity is 3000 yuan and the price is 4500 yuan 1. The store requires a discount of no less than 5% of the profit. How much discount is the minimum? 2. If the market situation is not good, the store requires that the sales without loss be sold at a discount. How much discount is the minimum? 3. If there is a large stock of this product, the store requires a discount of no more than 5% of the price at a loss. How much discount is the minimum?

1. Set a minimum discount of X to sell this commodity, because the profit is required to be no less than 5%. According to the meaning of the title, if 4500X ≥ 3000x (1 + 0.05) solves x ≥ 0.7, then the minimum discount of 7% can be given to sell this commodity

It is known that there are four products left after five A-type machines fill eight boxes in a day, and one product left after seven B-type machines fill eleven boxes in a day. Each A-type machine produces one more product than B-type machine?

Suppose each box has x products
(8x+4)/5=(11x=1)/7+1
56x+28=55x+5+35
x=12
Check it out, if there's a mistake

How to read English words from January to December

January
February
March
April April
May
June
July, July
August
September September
October
November
December

For five consecutive integers, the sum of squares of the first three numbers equals the sum of squares of the last two numbers

Let these five consecutive integers be n, N + 1, N + 2, N + 3, N + 4, N2 + (n + 1) 2 + (n + 2) 2 = (n + 3) 2 + (n + 4) 2, and the solution is n = 10 or n = - 2. When n = 10, these five numbers are 10, 11, 12, 13, 14. When n = - 2, these five numbers are - 2, - 1, 0, 1, 2

The function y = - 2x2-2x has a range of

Formula
y=-2x²-2x
=-2（x²+x）
=-2（x+1/2）²+1/2
So the range is (- infinity, 1 / 2]

Simple operation of 3.14 * 7.3 + 3.7 * 3.14-3.14

3.14*7.3+3.7*3.14-3.14
=3.14*(7.3+3.7-1)
=3.14*10
=31.4

How to deduce the high school physics formula V2 - (V0) 2 = 2aX (a is acceleration, V2 is final velocity, V0 is initial velocity) from v = V0 + at and x = v0t + 1 / 2at2?

s=1/2at^2+(v-at)t
2s=at^2+2vt-2at^2
2s=2vt-at^2
2s=2v*(v-v0)/a-(v-v0)^2/a
2as=(v-v0)(2v-v+v0)
2as=v^2-v0^2
I'm used to using s for distance
In physics, don't worry about this kind of problem, but learn more about the formula. The chapter of speed is not obvious. You will understand it later. It's a mathematical problem you ask. Just memorize it

How to express a plane with equation in space rectangular coordinate system?
Give an example and its solution, or directly describe the definition,
Is any plane in space, not so idealized. The second floor is the proof of high school. I expect the answer to be very complicated.

For example, the simplest space right angle system oxyz and the straight line perpendicular to the xoy plane are obviously the z-axis. Then all the vectors in this direction are the normal vectors of that plane. Whatever (0,0,1) (0,0,2) is OK, Which problem is convenient to use

Why is ice bigger than water

Because the density of water is higher than that of ice, and objects with higher density are smaller than other objects of the same mass. The reason why ice has higher density is that the crystal structure of ice is loose, the arrangement of molecules is orderly, and the distance between molecules is larger

Do you have the formula G + F = n

Yes,
If 1 is all vector, no other force is constant
If the scalar force is impossible without other forces, the centripetal force of gravity is in the same direction and the supporting force is in the opposite direction
G-F direction = n