Let m - (2x's Square - 3xy + XY's Square) (- XY) = (2x's Square, y + XY's Square) (x-2y)

Let m - (2x's Square - 3xy + XY's Square) (- XY) = (2x's Square, y + XY's Square) (x-2y)

M-(2x^2-3xy+xy^2)(-xy)=(2x^2y+xy^2)(x-2y)
M=(2x^2y+xy^2)(x-2y)-(xy)(2x^2-3xy+xy^2)
=2x^3y-4x^2y^2+x^2y^2-2xy^3-2x^3y+3x^2y^2-x^2y^3
=-2xy^3-x^2y^3

In quadratic function y = x ^ 2 + PX + Q, if P + q = 0, which of the following a (- 1, - 1) B (1, - 1) C (- 1, - 1) d (1,1)

If we want to eliminate P and Q, and the sum of them is zero, we have to let x equal to one, then we can know that the function passes (1,1)

In this paper, the second power of the polynomial 3x - 2XY + 4xy - 2 is written as the difference of two polynomials, so that one of them does not contain y

The original formula = (3x & sup2; - 2) - (2xy-4xy & sup2;)

Rational numbers are represented on the number axis. Their order from left to right is from small to large, that is, the number represented by the point on the left () the number represented by the point on the right

Rational numbers are represented on the number axis. The order from left to right is the order from small to large, that is, the number represented by the point on the left is (less than) the number represented by the point on the right

Function image: | ax-b | + | CX + D | how to draw
Please mark the coordinates of the turning point

Suppose that a, B, C and d given by you are all positive numbers
X1=b/a; X2= -d/c
When x > = X1 function = (a + C) X-B + D
When x2

A mumber of + plural noun or singular noun
PS: To summarize the phrases in this category
Please introduce the usage of this kind of phrases in detail
PS: Thank you for your answer

+Plural nouns. You can master them by remembering some simple examples. For example: a number of students love their teachers
To sum up: a singular phrase: much; a great deal of; many a; a great amount of
A plural phrase: a number of; many
A lot of = lots of; plenty of;
I don't remember the rest. You're looking for it. I hope it helps

In the triangle ABC, ab = 15, AC = 13, BC = 14, ad is perpendicular to BC and D, find the length of AD

According to the meaning of the title, we know that this triangle is an acute triangle
Let ad = x, and according to Pythagorean theorem, we obtain
BD=√(AB²-AD²)=√(15²-x²)
CD=√(AC²-AD²)=√(13²-x²)
Because BC = BD + CD
So √ (15 & sup2; - X & sup2;) + √ (13 & sup2; - X & sup2;) = 14
√(15²-x²)=14-√(13²-x²)
15²-x²=14²+(13²-x²)-28√(13²-x²)
28√(13²-x²)=140
√(13²-x²)=5
13²-x²=25
∴x=12
That is, ad = 12

Which word has the most synonyms in English

====
Good
====
Good is the most synonymous word in English, with 308 words in total
 

(99²+98²+… +90²)-(89²+88²+… +80²)

=(99²-89²)+(98²-88²)+…… +(90²-80²)
=(99+89)(99-89)+(98+88)(98-88)+…… +(90+80)(90-80)
=(99+89)*10+(98+88)*10+…… +(90+80)*10
=(80+81+82+…… +99)*10
=(80+99)*20/2*10
=17900

Some phrases about hand
It's better to be in junior high school. For example, hand in hand, by hand should have Chinese

He lives close at hand. He lives nearby. I always keep a dictionary (ready) at hand