The minimum range of X + 1 + X-2 + X + 3 is; in this case, X is equal to The minimum value of X + 1 + X-2 + X + 3 + x-4 is; in this case, the value range of X is

The minimum range of X + 1 + X-2 + X + 3 is; in this case, X is equal to The minimum value of X + 1 + X-2 + X + 3 + x-4 is; in this case, the value range of X is

The minimum value of X + 1 + X-2 + X + 3 is 5, where x equals - 1
The minimum value of X + 1 + X-2 + X + 3 + x-4 is 10, and the value range of X is - 1

If the value of 2Y2 + 3Y + 7 is 8, then the value of 4y2 + 6y-9 is ()
A. 2B. -17C. -7D. 7

The value of ∵ 2Y2 + 3Y + 7 is 8, ∵ 2Y2 + 3Y + 7 = 8, ∵ 2Y2 + 3Y = 1, ∵ 2 (2Y2 + 3Y) = 2 = 4y2 + 6y. Substituting 4y2 + 6y = 2 into 4y2 + 6y-9, 4y2 + 6y-9 = 2-9 = - 7

Human hair is about 20 microns in diameter, equal to () nanometers, the length of () atoms

20 μ M = 20000 nm, the diameter of the atom is 20 nm, so it is equivalent to 1000 atoms

The volume of a is larger than that of B. the possible relationship between the mass and density of a and B is 1.2

If the mass of a is less than or equal to that of B, the density of a must be less than that of B
If the mass of a is greater than that of B, the definite data must be given, otherwise it is impossible to judge the density

Given that the average and variance of a group of data x1, X2, X3 and X4 are 2, find the average and variance of another group of data 3x1-1, 3x2-1, 3x3-1, 3x4-1 and 3x5-1
Have you got the wrong number for 3x5-1

If the average of sample x1, X2,..., xn is a and the variance is m, then the average of sample a * X1 + B,..., a * xn + B is a * a + B and the variance is a ^ 2 * M;
So the answer to the above question is that the average is 5 and the variance is 18
I hope it will be helpful to your study

Given the parabolic equation x 2 = 4Y, two tangent lines PA and Pb of the parabola passing through the point (T, - 4), the tangent points are a and B respectively. (I) prove that the line AB passes through the fixed point (0,4); (II) find the minimum area of △ OAB (o is the origin of the coordinate)

(I) let a (x1, Y1), B (X2, Y2), and y '= 12x, then the equation of tangent PA is Y-Y1 = 12x1 (x-x1), that is y = 12x1x-y1, and the equation of tangent Pb is Y-Y2 = 12x2 (x-x2), that is y = 12x2x-y2. From (T, - 4) is the intersection of PA and Pb, we can see that: - 4 = 12x1t-y1, - 4 = 12x2t-y

How to select the cylinder pressure in the calculation of cylinder pressure

The formula is: F = P * a-f
F: Cylinder output (KGF) a: sectional area (cm2) P: applied pressure (kgf / cm2) f: frictional resistance (KGF)

Simple calculation of 0.25 by 1.63 by 4, 6.3 by 10.1 and 7.2 by 9.9

Original formula = 1 / 4 * 1.63 * 4 = 1.63
Original formula = 6.3 * (10 + 0.1) = 63 + 0.63 = 63.63
Original formula = 7.2 * (10-0.1) = 72-0.72 = 71.28
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e-y(dy\dx+1)=1

Is e ^ (- y) * (dy / DX + 1) = 1, dy / DX + 1 = e ^ y, dy / (e ^ y - 1) = DX integral, ln (e ^ y - 1) - y = x + C is obtained, which is the general solution

How many tons is a cubic meter of sand

Volume times density