If x and y are opposite to each other, and (x + y + 3) (x-y-2) = 0, find the value of X and y. The coefficient () of the unknown is called one variable linear equation If x and y are opposite numbers, and (x + y + 3) (x-y-2) = 0, find the value of X and y The coefficient of unknowns (), such an equation is called linear equation of one variable

x. Y is opposite to each other
∴x+y=0；-y=x
（x+y+3）（x-y-2）=0
(0+3)(2x-2)=0
6(x-1)=0
x=1
y=-x=-1
The number of unknowns is 1 and the degree is 1. Such an equation is called one variable linear equation

If a times the | x + 1 | square of x plus 3 = - 6 is the one variable linear equation of X, then the solution of the equation is () and the value of a is ()

The square of (x + 1) is equal to 1, so x is 0, - 2. Obviously, - 2 is obtained here. Then, substituting into the equation, a is 4.5

In the equal ratio sequence {an}, S3 = 7 / 4, S6 = 63 / 4, find an

s3=a1(1-q^3)/(1-q)
s6=a1(1-q^6)/(1-q)
s6/s3=(1-q^6)/(1-q^3)
(63/4)/(7/4)=(1+q^3)(1-q^3)/(1-q^3)
1+q^3=9
q^3=8
q=2
s3=a1(1-q^3)/(1-q)
7/4=a1(1-2^3)/(1-2)
7/4=7a1
a1=1/4
an=a1q^(n-1)
=1/4*2^(n-1)
=2^(n-3)

The school has a rectangular experimental field. If the length of the experimental field is reduced by 3 meters or the width is reduced by 2 meters, then the area is 72 square meters less than the original area

Width = 72 △ 3 = 24m
Length = 72 △ 2 = 36m
Area = 36 × 24 = 864 square meters

On the use of punctuation marks
For example, when Premier Zhou was asked what reading is for, he answered, "reading for the rise of China." in this case, what words should be used in the question mark?

The question mark should be filled with front and back quotation marks
When Premier Zhou was asked what he was reading for, he answered "reading for the rise of China"

A kind man writes 600 words

This is an old village, where there are old streets, it is a lively scene every day. People there are happy together, there is no exclusion, there is no oppression. The small animals in that village are so happy. It can be said that the people in that village are the happiest people in the world, and the animals in that village are the world

Five eighths of a meter is as long as one eighth of a few meters

Five eighths of a meter is as long as one eighth of five meters

Translation of 3A on page 36 of new curriculum standard

Don't bring food to the party. If you do, the teachers will confiscate it. Don't bring friends from other schools. If you do, the teachers will ask them to leave

14, 42, 63, what are the greatest common factor and the least common multiple

7 756

Given the linear function y = x + 3, when the value range of Y is 0 greater than or equal to y less than or equal to 3, the corresponding value range of X is ()
A. 0 is greater than or equal to X is less than or equal to 3
B. - 3 greater than or equal to x less than or equal to 0
C. - 3 greater than or equal to x less than or equal to 3
D. Not sure
2. The square of the linear function y = 2x-n of Y with respect to x must not pass through________ quadrant