If S2 = 2, S4 = 10, then S6 equals () A. 12B. 18C. 24D. 42

If S2 = 2, S4 = 10, then S6 equals () A. 12B. 18C. 24D. 42

The sum of the first n terms of ∵ arithmetic sequence {an} is SN. S2, s4-s2 and s6-s4 form arithmetic sequence, that is, 2, 8 and s6-10 form arithmetic sequence, 2 + s6-10 = 8 × 2 and S6 = 24, so C is selected

Let z = XY ^ 3-x ^ 2Y ^ 6, then what is the total differential DZ = at point (1,1)?

az/ax=y^3-2xy^6
az/ay=3xy^2-6x^2y^5
So DZ = (y ^ 3-2xy ^ 6) DX + (3xy ^ 2-6x ^ 2Y ^ 5) dy
The total differential at point (1,1) is DZ = - dx-3dy

19 / 12 times 3 / 14 minus 3 / 14!

Original formula = (19 / 12-1) * 3 / 14
=7/12*3/14
=1/8

The calculation formula of cylinder volume is π RR * h or 2 π R * h, R is the radius of cylinder bottom, h is the height of cylinder!
So what's 2 π R * h here?

πRR*H

Taylor formula of binary function?

The specific heat capacity of water is larger than that of ice?

When the same temperature is raised or lowered, water absorbs or releases more heat than ice

What's the difference between F = ma and F = mg? What about f-f = ma

The standard is f = ma, a of F = ma is the combined acceleration of the object, for example, an object has two accelerations, a is the combined acceleration of the two accelerations calculated by the parallelogram rule... A of F = Mg + Ma is not the combined acceleration, which is a very special case, such as the aircraft flying vertically to the ground, the aircraft engine is given to the aircraft

Logarithmic function inequality problem
Log 2 / 1 (2x + 1) is greater than or equal to 0, find the value range of X?

log1/2 (2x+1)>=0
∵ base 1 / 2

Calculation: (- 25) + (- 56) + (- 39) + 11 = what?

=67-64=3

We hope that when the value of a is odd, the value of the expression is "true", and when the value of a is even, the value of the expression is "false", then the following requirements cannot be met
A.A%2==1 B.(A%2==0) \x05C.(A%2) D.A%2

The answer is C,%, which means to take the remainder. In other words, 0 means false, and non-zero means true