The average of x1.x2.x3.x4. The average of X1 + 3.x2 + 3.x3 + 3.x4 + 3

The average of x1.x2.x3.x4. The average of X1 + 3.x2 + 3.x3 + 3.x4 + 3

If the average of x1.x2.x3.x4 is a
The average of X1 + 3.x2 + 3.x3 + 3.x4 + 3 is B
Then, B = a + 3

The tangent equation of parabola y ^ 2 = 4x with point P (1,2) as tangent point

That is x = 0.25y ^ 2
Y is regarded as a variable and Y is derived to get Dy (which can be understood as the reciprocal of tangent slope)
X'=0.5Y
Tangent point (1,2)
So x '= 1, that is, 1 / k = 1
So k = 1
So the equation is:
x-y+1=0

As shown in figure a, the exhaust volume of an automobile engine is known to be 2.0 L, and the average pressure of the gas in the cylinder during the power stroke
How much work does the gas do to the piston in one stroke?

Simple calculation of 1.25 times 0.32 times 9

1.25 by 0.32 by 9
=1.25x8x0.4x9
=10x3.6
=36
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Indefinite integral ∫ √ (1-y ^ 2) dy

y=cosx
Then √ (1-y ^ 2) = SiNx
dy=-sinx
Then sin2x = 2sinxcosx = 2Y √ (1-y ^ 2)
The original formula = ∫ (SiNx) ^ 2DX
=-∫(1-cos2x)/2 dx
=-1/4∫(1-cos2x)d(2x)
=-1/4(2x-sin2x)+C
=-[arccosy-y√(1-y^2)]/2+C

How many billion cubic meters is 15200 tons of sand equivalent to?

1.52/1.6=0.95
9500 m3 = 000095 million m3

Simplification of logic expression of digital circuit
Y = not a, not B, not c + AB, not c + A, not BC + not ABC + ABC

Y = A'B'C' + ABC' + AB'C + A'BC + ABC
= A'B'C' + ABC' + AB'C + (A' + A) BC
= A'B'C' + ABC' + AB'C + BC
= A'B'C' + ABC' + (AB' + B)C
= A'B'C' + ABC' + AC + BC
= A'B'C' + ABC' + AC + BC
= A'B'C' + A(BC' + C) + BC
= A'B'C' + AB + AC + BC

How many are the changes of the total differential? How many are the changes of the partial derivative? What is the calculation of the volume of a curved cylinder

Curved top column should be integrated with the first type surface

The car is going on the straight road at the speed of 10m / s
Suddenly, I found a bicycle moving in the same direction with the car at the speed of 4m / s in front of me. The car immediately turned off the accelerator and made a constant speed movement of a = 6m / S2. The car just didn't hit the bicycle, so the size of S was?

When the speed of a car and a bicycle is equal, they are closest to each other. (if they don't touch each other at this time, the distance between them will increase and they won't touch each other again.) so, the car just doesn't touch the bicycle, which means that the speed of the two cars is equal and the car just catches up with the bicycle. The time from braking to just catching up t = (v1-v0) / a = (4-1

Simple calculation: 99 * 99 + 99
Be sure

Formula = 99 * (99 + 1) = 99 * 100 = 9900