How much is one plus eighteen?

1+18=19

125 times 25 times 3232 times 69?
fast

125*25*4*808*69=125*8*101*69*100=6969*1000*100=696900000

How much is 113 times 69

7797

Enshi's green, selenium rich products and characteristic agricultural products are quite competitive in the international market. Among them, shiitake mushrooms are exported to Japan and South Korea. At the time of listing, manager Li, a foreign businessman, purchased 2000 kg of shiitake mushrooms in our state at the market price of 10 yuan / kg and stored them in the cold storage. According to the forecast, the market price of shiitake mushrooms will rise by 0.5 yuan / kg every day, but the cost of storing these mushrooms in the cold storage is required every day The total cost is 340 yuan, and the mushrooms can be stored in the cold storage for 110 days at most. At the same time, an average of 6 kg of mushrooms are damaged every day and can not be sold. (1) if the mushrooms are sold at one time after X days of storage, assuming that the total sales amount of these mushrooms is y yuan, try to write the functional relationship between Y and X. (2) how much do Li Jing want to store these mushrooms to make a profit of 22500 yuan Days later? (profit = total sales amount - acquisition cost - various expenses) (3) how many days can manager Li store these mushrooms and sell them to get the maximum profit? What is the maximum profit?

(1) The functional relationship between Y and X is y = (10 + 0.5x) (2000-6x), = - 3x2 + 940x + 20000 (1 ≤ x ≤ 110, and X is an integer); (2) by solving the equation: - 3x2 + 940x + 20000-10 × 2000-340x = 22500, it is obtained that: X1 = 50, X2 = 150 (not suitable for the problem, omit) Li Jing's ideal profit of 22500 yuan needs to store this batch of mushrooms for 50 days; (3) set the profit as W, it is obtained from the equation Yide w = - 3x2 + 940x + 20000-10 × 2000-340x = - 3 (X-100) 2 + 30000 ∵ a = - 3 ∵ 0, the opening direction of parabola is downward, when ∵ x = 100, Wmax = 30000, 100 days ∵ 110 days ∵ after 100 days of storage, the maximum profit of 30000 yuan can be obtained by selling this batch of Lentinus edodes

The sum of two two digits is 68. Write the smaller two digits on the right side of the larger two digits to get a four digit number. Write the smaller two digits on the left side of the larger two digits to get a four digit number. It is known that the first four digits are 2178 larger than the last four digits. Find the two two two digits in the equation book, but I can't understand them,

Let the larger two digits be x, and the smaller two digits 68-x: X
To the right of the larger two digits, write the smaller two digits to get a four digit number: 100x + (68-x);
Write the smaller two digits to the left of the larger two digits to get a four digit number: 100 (68-x) + X;
100X+(68-X)-[100(68-X)+X]=2178
100X+68-X-6800+100X-X=2178
198X=2178+6732=8910
X=8910/198=45,
68-X=23,
The larger two digit number is 45, and the smaller two digit number is 23

1/2＋1/3－1/4×1/5÷1/6 + 1/7-1/8×1/9÷1/10……… ÷1/100=?
1/2＋1/3－1/4×1/5÷1/6 + 1/7-1/8×1/9÷1/10……… 1/100=？

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Among the following options, it is suitable for an approximate value of equation a ^ 3 + A ^ 2 = 6A + 6 (accurate to 0.1)
A2.6 B2.5 C2.4 D2.3
(^ means square, for example, ^ 3 is cubic)

a^3+a^2=6a+6
a^2(a+1)=6(a+1)
(a^2-6)(a+1)=0
(a + radical 6) (a-radical 6) (a + 1) = 0
A1 = - radical 6, A2 = radical 6, A3 = - 1
Root 6 ≈ 2.449
So the closest approximation is 2.4
Choose C

Given that a + B = - 2014, ab = 5, find the value of (A's square + 2013a + 4) (B's square + 2015b + 6)

Turn a + B = - 2014 back to: - 2014 = a + B. then change 2013 into - 1 - (a + b) and 2015 into 1 - (a + b) in the formula, so it's easy to go on

A school volunteer team bought a batch of milk on the Double Ninth Festival and went to the "sunset red" nursing home to express sympathy to the elderly. If each old man was given 5 boxes, 38 boxes would be left. If each old man was given 6 boxes, the last old man was less than 5 boxes, but at least one box would be given. (1) if there were x old people in the nursing home, how many boxes of milk would there be? (2) how many old people are there at least in the nursing home? How many old people are there at most?

(1) Suppose there are x old people in the nursing home, the number of milk boxes: (5x + 38) boxes; (1 point) (2) suppose there are x old people in the nursing home, the root meaning of the question is: 5x + 38 − 6 (x − 1) < 55x + 38 − 6 (x − 1) ≥ 1, (4 points) ｜ the solution set of the inequality system is: 39 < x ≤ 43, (6 points) ∵ x is an integer, ｜ x = 40, 41, 42, 43, a: there are at least 40 old people in the nursing home, and at most 43 old people. (8 points) ）

It is known that in the isosceles triangle ABC, ab = BC = 4, AC = 6, D is the midpoint of AC, e is the moving point on BC (not coincident with B and C), connecting De, passing through point d to make ray DF, so that the angle EDF = angle a, ray DF intersects ray EB with point F, and ray AB intersects at point H,
EC = x, BF = y, find the analytic expression of the function where y equals x, and write out the definition field of X

The parallel line DF 'passing through point D makes AB intersect with F', and △ DCF 'rotates counterclockwise around point D
It is easy to know that x + y = BF ′ = 2
So, y = 2-x and 0 ∠ x ∠ 2

How much is one plus eighteen?