It is known that the solution of the equations x + y = 7m and X-Y = 11m about X and Y is a solution of the equation 3x + 2Y = 5, and the value of M is obtained Using binary linear equation

It is known that the solution of the equations x + y = 7m and X-Y = 11m about X and Y is a solution of the equation 3x + 2Y = 5, and the value of M is obtained Using binary linear equation

x+y=7m (1)
x-y=11m (2)
(1)+(2)
2x=18m
x=9m
Substituting (1)
9m+y=7m
y=-2m
So 3x + 2Y = 27m-4m = 23m
3x+2y=5
So 23m = 5
m=5/23

Find y = 2x ^ 2 + 3 (x

Y inverse = - √ [(Y-3) / 2]) (x

Given that a is a real number, the function f (x) = (X & # 178; + 3 / 2) (x + a)
If the image of the function f (x) has a line tangent which is parallel to the X axis, the value range of a is obtained

The f (x) image has a tangent parallel to the X axis
That is, f '(x) = 0 has a solution
3x ^ 2 + 2aX + 3 / 2 = 0
（2a）^2-4*3*3/2≥0
The solution is a ≤ - 3 √ 2 / 2 or a ≥ 3 √ 2 / 2

Given that f (x) is an even function, G (x) is an odd function and f (x) + G (x) = 1 / X-1, find f (x), G (x)

Because
F (x) is an even function and G (x) is an odd function
So f (x) = f (- x)
g(x)=-g(-x)
f(x)+g(x)=1/x-1
f(x)-g(x)=-1/x-1
Add the two together
f(x)=-1
Bring in
g(x)=1/x

Let a and B be orthogonal matrices of order n, and a / b = - 1, it is proved that a + B = 0

Because a, B is an orthogonal matrix, because a, B is an orthogonal matrix, so ┃ a 94759475947594759475┃ a + A + B ┃ ┃9475;9475947594759475\9475\9475\\\\\9475\9475\\\\\\9475\\\\\\\\\\\\\\\\a + B ┃ = 0. So ┃ a + B ┃ = 0
A 'is the transpose of A

If it means singular, the predicate verb is in the singular; if it means plural, the predicate verb is in the plural
What clause as subject
What clause as subject, if it means singular, then the predicate verb is in singular form; if it means plural, then the predicate verb is in plural form
Examples given in the book: what he wanted to know was why they didn't tell him? What part of the singular meaning is? What he wanted to know or why they didn't tell him

What clause as subject, if it means singular, then the predicate verb is in singular form; if it means plural, then the predicate verb is in plural form
(what) clause as subject, predicate verb in singular form
Two (or more) parallel clauses are used as the subject and the predicate is plural;
The infinitive is the subject and the predicate verb is singular
Two or more parallel infinitives are used as the subject, and the predicate is in the plural;
Gerund as subject, predicate verb in singular form
Two or more coordinate gerunds are used as subjects and the predicate is plural;

Such as (1-x third power) / (1-x), this kind of (1-x third power) becomes (1-x) (1 + X + x) which I can't think of. Is there any formula of this type?

There is no formula, factorization is a lot of experience, especially high times, we need to use division

The dictionary can't count whether the amount of is countable or uncountable. But why is the amount of things in the Oxford Textbook? There are several places. How to explain

A large number of, a large amount of, Hu Ge amount of with countable or uncountable noun, the former with countable noun, the latter two with uncountable noun a large number

As shown in the figure, the side length of the square oabc is 1cm, which is a visual image of a plane figure placed horizontally, then the perimeter of the original figure is______ ．

The length of oabc is 1, which is a visual image of a plane figure placed horizontally, so ob = 2cm, the height of parallelogram of the original figure is 22cm, so in the original figure, OA = BC = 1cm, ab = OC = (22) 2 + 12 = 3cm, so the perimeter of the original figure is 2 × (1 + 3) = 8cm, so the answer is: 8cm

Write a 60 word essay about how you and your family go to work and school every day
Remember, don't exceed the scope of words!
As long as 60 words or so OK!

I am a grade 8 student.There are 4 people in my family.My mother gets up at 6a.m. and cooks for us .My father ,my sister and I get up at 6.30a.m. and then we have breakfast .My father drives my mother to her factory.My sister and I ride to school and go home by bus.My father drives my mother home.