2. When y = 0, the coordinates of the two straight lines are (-3/5,0), which means that the two straight lines have a common point, both on the X axis.
When x=0, the coordinates of the two straight lines are (0,5/4) (0,5/4) respectively. These two points are symmetrical about x axis.
3. Let the straight line parallel to the straight line 12x-5y+3=0 be 12x-5y+c=0. The distance from the point (0, c/5) to the known straight line is:
4=| 12*0-5*(c/5)+3|/sqrt( 12^2+5^2)
4 = | c+3 |/Sqrt( 169)= | c+3 |/ 13
4* 13=|c+3| 52=|c+3|
So c=49, c=-55.
Then the linear equation is:
12x-5y+49=0。
12x-5y-55=0。 , 5,2. The slope is multiplied by-1, 2, and al in halo is 1. That is y = a * (lnx)+b.
2. replace y with -y to get.
3. Let the linear equation become
12x-5y+a=0
Take a point A from12x-5y+3 = 0 (-1/4,0).
The distance from a to 12x-5y+a=0 is 4.
According to the distance formula
┃- 1/4* 12+a┃/√( 12^2+5^2)=4
arrange
┃-3+a┃=4/ 13
A=43 ..., 2, y=aln x+b a times ln x.
Axisymmetry about x means that for the same x value, the y values of two straight lines are opposite. 2. Multiple-choice questions: This big question * * 12 small questions, with 5 points for each small question and * * 60 points. Of the four options given in each question, only one meets the requirements of the topic. ?
1. Let the complete set be I, pt = s.
TS=I (B)P=T=S (C)T=I (D)P=I
2. If I=Z, M= and S=, then M is.
(A) (B)
(C) (D)
3. If f(x)=(x+|x|), f (f (x)) is
, 1, challenge senior three mathematics-several math problems. Thank you!
Example of application of 1. function: What does al mean in y=aln x+b?
2. If the straight line L and the straight line 3x-4y+5=0 are symmetrical about X, then the equation of the straight line L is 3x+4y+5=0 (I don't understand why? )
3. What is the equation that a straight line is parallel to the straight line 12x-5y+3=0 and the distance is equal to 4? (Please write down the detailed process) Thank you!