Horizontal pronunciation and word formation

Horizontal pronunciation and word formation

Heng first and fourth (horizontal line) (overbearing)

There are several pronunciations of Chinese characters, and what words can be formed?

There are two kinds, the first and the fourth

Novice for two higher number problems: second derivative y = ln (1 + x ^ 2) and a y = (1 + x ^ 2) ^ 1 / 2 speed

Y‘=1/(1+x^2) *2x Y''= -4x^2 / (1+x^2)^2 +2/(1+x^2)
y=（1+x^2)^1/2 y'=x*(1+x^2)^(-1/2) y''= (1+x^2)^(-1/2) -x^2*(1+x^2)^(-3/2)

Use the word "Jing" to form words in ()
1. The small plane toy made by Zhang Hua is very beautiful
The instrument of () is very valuable
3. () send me crafts attracted many Chinese and foreign audiences
4. In the process of designing artificial satellite, calculation is very important

1. Delicacy 2. Delicacy 3. Meticulousness 4. Delicacy

In the same rectangular coordinate system, we make a graph of the functions y = - 1 / 2x + 3 and y = 1 / 2x. 1 / 2 is negative 1 / 2 and 1 / 2 is 1 / 2

For a function y = - 1 / 2x + 3, find two points, generally find the intersection of X axis and Y axis. When x = 0, y = 3 is (0,3) point; when y = 0, x = 6 is (6,0) point. Connect these two points and draw a straight line
For y = 1,2x, you must pass (0,0) point, that is, the origin. You can find a point. For example, when x = 2, y = 1 is (2,1) point, and you can draw a straight line connecting the origin and this point

Let a, B, C be the three sides of △ ABC, and the quadratic function y = (a-b2) x2-cx-a-b2 take the minimum value of - 85B when x = 1, then △ ABC is ()
A. Isosceles triangle B. acute triangle C. obtuse triangle D. right triangle

From the meaning of the title, we can get -- C2 (a-b2) = 1a-b2-c-a-b2 = - 85B, that is, B + C = 2Ac = 35b, so C = 35b, a = 45B, so A2 + C2 = B2, so △ ABC is a right triangle, so D

a∧m×a∧n=a∧（m+n）,

It is proved that: let a ^ n = XA ^ m = y get log (a) x = n from the reciprocal of exponential logarithm, log (a) x = m, then log (a) x + log (a) y = m + n ∵ log (a) xy = log (a) x + log (a) ylog (a) xy = log (a) a ^ n * a ^ m ∥ log (a) a ^ n * a ^ m = log (a) x + log (a) y = m + n from the reciprocal of exponential logarithm, get a ^ m × a ^ n = a ^ (M + n)

As shown in the figure, in △ ABC, ab = AC, ∠ BAC = 120 °. D is the midpoint of BC, de ⊥ AB is proved at point E: EB = 3EA

It is proved that: ∵ AB = AC, ∵ BAC = 120 ∵ B = ∵ C = 30 ∵ D is the midpoint of BC ∵ ad ⊥ BC and ad bisects ∵ BAC, ∵ bad = 60 ∵ ADB = 90 ∵ ad = 12ab and