Limx tends to infinity (x ^ 2 + 1 / 2x + 1) what is SiN4 / X equal to

Limx tends to infinity (x ^ 2 + 1 / 2x + 1) what is SiN4 / X equal to

solution

Find the limit limx inverse 2 (1 / x-2-4 / x ^ 2-4)

limx->2 (1/x-2-4/x^2-4)=1/4

If a is a rational number, compare the size of a and 3a

When a > 0, a < 3a
When a < 0, a > 3a
When a = 0, a = 3A

The length of an express train is 306m, and that of a slow train is 344M. When two trains run in opposite directions, it takes 13s from meeting to leaving. If two trains run in the same direction, the express train will catch up with the slow train
It takes 65s to surpass the local train speed!
Urgent, request help, process, equation

Let the fast train speed be x meters per second and the slow train speed be y meters per second
13(x+y)=306+344
65(x-y)=306+344
x+y=50
x-y=10
x=30
y=20
A: the fast train speed is 30 meters per second, and the slow train speed is 20 meters per second

How to represent a circle in polar coordinates

1) 2) the center of the circle is on the polar axis, the pole is on the circle, the radius is a, the equation of the circle is ρ = 2acos θ, 3) the center of the circle is on the opposite direction of the polar axis, the pole is on the circle, the radius is a, the equation of the circle is ρ = - 2acos θ, 4) the center of the circle is over the pole and perpendicular to the polar axis

There is a batch of cement on the construction site. Two fifths of the cement was transported in the first day. The next day, 5 tons less than the first day. There are still 35 tons left. How many tons of this batch of cement?

(35－5)÷﹙1－2／5×2）＝30÷1／5＝150

In the triangular pyramid o-abc, the three edges OA, OB and OC are perpendicular to each other, and OA > ob > OC respectively pass through OA, OB and OC to make a section and divide the volume of the triangular pyramid equally. The section area is S1, S2 and S3 in turn, then the minimum value of S1, S2 and S3 is______ ．

Taking the midpoint D of BC, connecting od and ad, the planar oad bisects the volume of triangular pyramid, that is, the area of triangular oad is S1. In RT △ BOC, OD is the middle line on the hypotenuse BC, ∧ od = 12bc, ∧ OA ⊥ ob, OA ⊥ OC, ∧ OA ⊥ planar BOC, ∧ OA ⊥ OD, ∧ S1 = OA × 12od, that is, S12 = 14oa2o

When transporting a batch of coal, 20% of the coal was transported in the first time, 6 tons in the second time, and 2 tons less than the sum of the previous two times in the third time. At this time, 1 / 3 of this batch of goods remained to be transported. How many tons of this batch of goods in total?

X*0.2+6+(x*0.2+6-2)=2/3X
The solution is x = 37.5, that is, the total cargo is 37.5t

The linear equation of 3x-4y + 12 = 0 with respect to Y-axis symmetry is?
Seeking process

The straight line 3x-4y + 12 = 0 intersects the X axis and Y axis at (0,3) (- 4,0) respectively. Because the straight line is symmetrical with respect to the Y axis, the straight line must pass through two points (0,3) and (4,0)
  y   =  3
    0  =  4k  +  b
&Therefore, the equation of the symmetric line is & nbsp;
 y = -3/4 x  + 3

There are 270 female employees in a factory, which is 7 / 9 of the male employees. How many employees are there in the whole factory
Seven out of nine male employees!

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