For a manuscript, it takes 14 hours for a to type alone and 20 hours for B to type alone The two work alternately. Then when the manuscript is finished, Party A and Party B need to work together___ Hours

For a manuscript, it takes 14 hours for a to type alone and 20 hours for B to type alone The two work alternately. Then when the manuscript is finished, Party A and Party B need to work together___ Hours

Party A and Party B need: 1 △ 17140 (114 + 120) = 8417 (hours); 17140 × 417 = 135; this part of the work is completed by Party A alone, and it also needs: 135 △ 114 = 25 (hours), so the two people share: 8 × 2 + 25 = 1625 (hours). Answer: the two people share 1625 hours. So the answer is: 1625

Given the equations 2x + y = 2A + 1, x + 2Y = 2A, what is the value of the square of X-Y

0
Are you in high school or junior high school?
In high school, there's still the possibility of an imaginary number

As shown in the figure, the generatrix length of the cone is 3, the radius of the bottom surface is 1, and a is a point on the circumference of the bottom surface. The shortest route from point a to the side and back to point a is______ ．

The arc length of the sector in the graph is 2 π. According to the arc length formula, 2 π = 3 π n180  n = 120 ° is obtained, that is, the center angle of the sector is 120 ° and the chord length of the opposite arc is 2 × 3 sin60 ° = 33

The difference between the two numbers is 7.4. If the subtraction is increased by 5.2, the difference is 12.6
identical

The difference between the two numbers is 7.4. If the subtraction is increased by 5.2, the difference is 12.6
The checking method of decimal addition and subtraction is the same as that of integer addition and subtraction (√)

If the perimeter of circle a is one third of the radius of circle B, the area of the big circle is 763.02 square centimeters, and the area of the small circle is how many square centimeters?

Small circle R, area s,
Big circle R
∏R^2=∏*(2*∏*r*3)^2
=36∏^2**∏r^2
=36∏^2*S
S = 763.02 / (36 Π ^ 2), Π = 3.14
S≈2.15

As shown in the figure, ah is the height of △ ABC, the quadrilateral ABDE and acfg are both square, and the extension line of HA intersects eg at point M

Point E is the extension line of EN ⊥ HM, point n, point G is the extension line of GP ⊥ HM, point P, and \\\\\\\\\\\\\\\\\\\pointe is the extension line of EN \\\\\\\\\\\\\\\\\\\\\\\\\\\\it's not easy In the △ ENA and △ AHB, the optionena = AHB, and the gmpen = GP, ≌ ENM ≌ GPM (AAS), ≌ EM = GM

Given that the chord length of the arc is L = 20m and the arc height is h = 2.6m, the length C of the arc is?

Excel formula: = degrees (asin (60 * chord length / (225 * 4 + chord length * chord length))) * 4 * 3.1415926 * (225 / 30 + chord length * chord length / 120) / 360. If you put this formula in B1, and the chord length is quoted in A1, you can enter it in A1

Let f (x) = a ^ X / (a ^ x + √ a) the x power of a and a under the root sign of a (a is greater than zero) find s = f (1 / 2007) + F (2 / 2007) +. + F (2005 / 2007) + f (2006 / 2007)
The x power of a and the sum of a under the root sign

Find the law, for any X
f(x)+f(1-x)
=a^x/[a^x+a^(1/2)]+a^(1-x)/[a^(1-x)+a^(1/2)]
=a^x/[a^x+a^(1/2)]+a^(1-x)*a^(x-1/2)/{[a^(1-x)+a^(1/2)]*a^(x-1/2)}
=a^x/[a^x+a^(1/2)]+a^(1/2)/[a^(1/2)+a^(x)]
=1
So s = f (1 / 2007) + F (2006 / 2007) +... + F (1003 / 2007) + F (1004 / 2007) = 1003

What can we learn from the ancient poems chanted by wanderers

The first two sentences of the poem are about mother and son, about thread and clothes, but they point out that mother and son depend on each other

Image and properties of inverse scale function
If the function y is equal to (2m + 1) x and the image of y equal to 3 / x minus m has no intersection, then the starting range of M is?

If the function y = (2m + 1) x and y = (3-m) / X have no intersection, then
2m+1>0
3-m-1/2
m>3
from
2m+10
M > 3
From M