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Let u = XY (x > 0, X ≠ 1), then Du=
du=ydx+xdy
If u = x / y, then the total differential Du=
du=1/y dx-x/y^2dy
We first derive x, then add DX, then derive y, and then add dy
How many feet is 74 cm around the waist?
2.3 feet
Primary school mathematics problem a number is six out of eleven, which is exactly equal to eight out of twenty-five of the other number. How much is the other number?
The other is 6 / 11 △ 8 / 25 = 75 / 44
What fraction minus what fraction is one sixth?
1/2-1/3=1/6
How many cubic meters of gas can be gasified by one kilogram of liquefied natural gas?
According to the general characteristics of liquefied natural gas (gb19204-2003), one unit of liquefied natural gas can be vaporized into 568 ~ 590 units of gaseous natural gas at 0 ° and one standard atmospheric pressure, which is generally calculated as 600,
For example, if the graph is a fan-shaped statistical graph, if it is represented by a bar statistical graph, then the ratio of the heights of the corresponding four bars a, B, C and D is
A=120°B=60°C=30% D=20%
60:120:20%*360:30%*360
=60:120:72:108
=5:10:6:9
One two three four what column is 39 in? It is expressed in the formula. One two three four eight seven six five nine ten eleven twelve
1,2,3,4
8,7,6,5
9,10,11,12
16,15,14,13
.
39=4*8+7=5*8-1
So in line 9, column 4
How to calculate this mathematical reasoning? 1,2,2,4,3,8,4,5
16
The even number term is the nth power of 2
As shown in the figure, ab = AC, Bo = Co, ∠ BOC = 160 °, calculate the degree of ∠ AOB
In △ AOB and △ AOC, ab = acbo = Coao = Ao ≌ AOB ≌ AOC (SSS), ≌ AOB = ≌ AOC, ≌ AOB = (360 ° - ≌ BOC) △ 2 = 100 °
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