How many pronunciations does Lei He Sai have? How to make a polyphonic word? It's urgent

How many pronunciations does Lei He Sai have? How to make a polyphonic word? It's urgent

tired
L é I is full of fruits;
L ě I cumulative
Tired
stopper
S ā I plug
S à I frontier fortress
S è block

May I ask how to make up the fourth pronunciation?

Dizziness and dizziness

Other pronunciation and word formation of Zhuo

Anxious
Persistent
(softly) watch

Given that the square difference of two consecutive odd numbers is 40, then the two consecutive odd numbers are?

9、11
Let these two odd numbers be x and X + 2, then
(x + 2)^2 - x^2 = 40
Simplification by square difference formula
(X + 2)^2 - x^2 = 40
(X + 2 + x) * (x + 2 - x) = 40
(2x + 2) * 2 = 40
2x + 2 = 20
x = 9
Therefore, x + 2 = 11
So these two consecutive odd numbers are 9 and 11

Divide a triangle into three triangles of equal area. How many ways can you think of?

As shown in the figure, it is the required drawing

The motion graph belongs to both translation and rotation
A the wheels of a moving bicycle
B movement of the hour hand and minute hand
The movement of elevator in C high building
The d-ball falls freely from high

A

Judge the position relationship between X ^ 2 + y ^ 2-2x + 4Y + 4 = 0 and 4x ^ 2 + 4y2 ^ - 16x + 8y + 19 = 0
(x-1) ^ 2 + (y + 2) ^ 2 = 1, center 1, - 2, radius 1
(2x-2) ^ 2 + (y + 2) ^ 2 = - 11, center 2, - 2
What should I do next? I can't work out the difference between the two centers

X ^ 2 + y ^ 2-2x + 4Y + 4 = 0, we can get: (x-1) ^ 2 + (y + 2) ^ 2 = 1
So there's the center of the circle, the coordinates are (1, - 2), and the radius R is 1
4x^2+4y2^-16x+8y+19=0
x^2-4x+4+y^2+2y+1=4+1-19/4
(x-2)^2+(y+1)^2=1/4
So the center coordinate of the circle is (2,1) and the radius R is 1 / 2
The distance between the centers of two circles can be obtained as follows:
D=√[(1-2)^2+(-2+1)^2]=√2
R+r=1+1/2=3/2
R-r=1-1/2=1/2
Because: R-R

If A. B is a non-zero vector, we prove that | a + B | = | a | + | B |, if and only if a and B are collinear and in the same direction

|a+b|=|a|+|b|
Two sides square
a^2+2ab+b^2=a^2+b^2+2|a||b|
2ab=2|a||b|
ab/(|a||b|)=1
That is cos θ = 1
Then θ = 0
That is, a and B are collinear and in the same direction

It is known that in △ ABC, the vertical bisectors of AB and AC intersect BC at e and f respectively. The degree of ∠ EAF can be calculated

Let ∵ B = x, ∵ C = y. ∵ BAC + B + C = 180 ° and ∵ BAC = 150 ° x + y = 30 °. The vertical bisectors of ∵ AB and AC intersect BC at e, F, ∵ EA = EB, FA = FC, ∵ EAB = ∵ B, ∵ fac = ∵ C. ∵ EAF = ∵ BAC - (x + y) = 150 ° - 30 ° = 120 ° respectively

The function f (x) = a1x + a2x ^ 2 +. + anx ^ n, A1, A2, A3,... An forms an arithmetic sequence
And A1 = 4, FN (1) = (3N ^ 2 + BN) / 2,
Find the value of B
The general term formula of the sequence {an}

fn（1)=a1+a2+...+an=na1+n(n-1)/2=4n+d*n(n-1)/2
So 4N + D * n (n-1) / 2 = (3N ^ 2 + BN) / 2, that is 8 + D (n-1) = 3N + B
So d = 3, B = 5
an=a1+(n-1)d=4+3(n-1)=3n+1