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() technology () equipment () instrument () calculation () language
Fill in the blanks with "Jing"
(superb) technique
(excellent) equipment
A precision instrument
(accurate) calculation
(refined) language
What is the meaning of "Ji"
OK! Come on
The total amount of audit is countless
Write words according to the different meanings of smell, and smell what you hear
There is also reason, reason, reason, the words and deeds of other people's attitude management to tidy up
Hearing: hearing the news
What I heard: hearsay
The famous: the famous
Sniff: smell
3 / 40 square meters = () square decimeters 16 / 25 liters = () ml 450 cubic decimeters = () cubic meters
3 / 40 square meters = (7.5) square decimeters 16 / 25 liters = (640) ml 450 cubic decimeters = (0.45) cubic meters
Simple operation of 9999 * 7777 + 3333 * 6666
=9999*7777+3333*3*2222
=9999*7777+9999*2222
=9999*(7777+2222)
=(10000-1)*9999
=10000*9999-1*9999
=99990000-9999
=99980001
The graph of the first-order function passing through point Q (0,3.5) intersects with the graph of the positive scale function y = 2x at point P. the equation that can represent the graph of the first-order function is?
The answer is 3x + 2y-7 = 0. If the analytic expression of the first-order function is y = KX + B, then the analytic expression of the first-order function can be obtained by using the undetermined coefficient method according to the point P (1,2) and point Q (0,3.5). Answer: let the analytic expression of the first-order function be y = KX + B
∵ this line passes through points P (1,2) and Q (0,3.5),
∴ {k+b=2b=3.5,
{k=-1.5b=3.5．
So the analytic expression of this first-order function is y = - 1.5x + 3.5, and then what are the following steps?
The abscissa of point P is 1,
∴y=2×1=2,
The coordinates of point P are (1,2),
Let the analytic expression of a function be y = KX + B,
Then B = 3.5
k+b=2
∴k=-1.5
The analytic expression of this linear function is y = - 1.5x + 3.5,
That is, 3x + 2y-7 = 0
That's it
If you are satisfied, please click "select as satisfied answer" at the bottom of the screen,
A cuboid has a volume of 54 cubic meters, a bottom area of 18 square meters and a height of () decimeters
A cuboid has a volume of 54 cubic meters, a bottom area of 18 square meters and a height of (3) decimeters
Add, subtract, multiply and divide the numbers 3, 4, - 6 and 10 (each number must be used once), and write at least three formulas whose results are equal to 24
3×(-6+10+4)=24
4-(-6x10÷3)=24
10-(-6x3+4)=24
10-4-3×（-6）=24
Starting function of constant power locomotive with resistance
The formula without resistance is PT = 0.5mv ^ 2
We get v = √ [(2P / M) t]
So what about those with resistance? Because the actual problems all have ending speed
I want the relation of this function image or to find the displacement s with definite integral later
On the first floor, I'm not asking for the final velocity. Given the conditions P and F, I want to find V at any time t and the displacement s at the final velocity
On the second floor, DS / dt = DV. S is the integral of V in T, not the differential s
And P = FDV + mvdv / dt
I don't understand
From the energy conservation, the displacement of DS in DT time increases the speed DV
Then PDT = FDS + D (& frac12; MV ^ 2) = FDS + mvdv
Divide DT by DS / dt = DV
That is, the differential equation P = FDV + mvdv / dt
After finishing
mvdv
-----=dt
P-fv
Then V integral is OK, LZ integral is OK, you can't consult the integral manual or ask me again~
After finding V (T), we can get s (T)
Is that what LZ should want?
What is the weight of Q345 steel plate with a thickness of 20 mm and a length of 8.966 m and a width of 45 cm
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