Thank you! Easy 1.x(x-1)(x-2)-6 2.1-xy(1-xy)-x^3y^3 3.x^2+4xy+4y^2-2x-4y+1 thank you It's a process! It's a process! It's a process! It's a process! It's a process! It's a process! It's a process!

Thank you! Easy 1.x(x-1)(x-2)-6 2.1-xy(1-xy)-x^3y^3 3.x^2+4xy+4y^2-2x-4y+1 thank you It's a process! It's a process! It's a process! It's a process! It's a process! It's a process! It's a process!

1.x(x-1)(x-2)-6 =x[x^2-3x+2]-6=x^3-3x^2+2x-6=x^2(x-3)+2(x-3)=[x-3][x^2+2]2.1-xy(1-xy)-x^3y^3 =[1-xy][1+xy+x^2y^2]-xy[1-xy]=[1-xy][1+xy+x^2y^2-xy]=[1-xy][1+x^2y^2]3.x^2+4xy+4y^2-2x-4y+1=[x+2y]^2-2[x+2y...

It is known that the quotient of a multinomial polynomial 2x3-4x2-1 divided by polynomial A is 2x, and the remainder is X-1, then polynomial A is 2x______ ．

According to the meaning of the title: 2x3-4x2-1 △ a = 2x So the answer is: x2-2x-12

)(easy!)
It is known that, as shown in the figure, in the quadrilateral ABCD, AB > CD, e and F are the midpoint of the diagonal BD and AC respectively, and the verification: EF > 1 / 2 (ab-cd)
(sketch: e and F are under the intersection of diagonal lines, on the same side)

The answer on the first floor is wrong
Take the midpoint of AD, set it as G, connect eg, FG
Then there is eg = 1 / 2Ab, FG = 1 / 2CD on the first floor
In EFG, according to the difference between the two sides is less than the third side, the
FG-EGFG-EG=1/2AB-1/2CD=1/2(AB-CD)

What do the two numbers of a number pair represent?

Guo Dunyong answer: number pair is generally used in number theory, which generally refers to two numbers with a given definition. Especially in the proof of Goldbach conjecture, the definition of large even number 2n is the sum of two odd numbers J α and J β, that is, 2n = J α + J β, then it is called the odd number pair of J α and J β 2n, and the odd number pair of 2n is divided into composite pair, composite prime pair and prime sum

(5,1) (5,2) (5,3) (5,4) ···· what are the same and different positions represented by these number pairs?

（x,y）
Therefore, the above figures are the same value of X and different value of Y
That is, for example, on the number axis, horizontally in a row, vertically different
It can also be said that the seats are in a row

If point a is represented by (1,5), point B by (1,1), and point C by (3,1), then the triangle ABC must be a () triangle
A. Acute angle B. obtuse angle C. right angle D. isosceles

The method of number pair representing position is: the first number represents column, and the second number represents row; therefore, the position of a, B, and C can be marked by using the square diagram, and the triangle can be obtained by connecting them in sequence, as shown in the figure: ab ⊥ BC can be obtained according to the square diagram, so the triangle is a right triangle, so select C

How to express number pair (2.1)
Please draw a picture for me!

7┌┬┬┬┬┬┬┬┬┐
6├┼┼┼┼┼┼┼┼┤
5├┼┼┼┼┼┼┼┼┤
4├┼┼┼┼┼┼┼┼┤
3├┼┼┼┼┼┼┼┼┤
2├┼┼┼┼┼┼┼┼┤
1├●┼┼┼┼┼┼┼┤
0└┴┴┴┴┴┴┴┴┘
one two three four five six seven eight nine
It's a bit inaccurate, but you can match the numbers according to the points
(column, row)

Let's talk about what number means to the first and what is the second

Number pairs are equivalent to coordinates, so it's easy to judge the position of a place. Number pairs can not only represent two-dimensional space (length, width), but also three-dimensional space (length, width, height) or four-dimensional space (length, width, height, time). All points in the world can be represented by number pairs. The first one represents column and the second one represents row. The column and row number are separated by commas, and the number pairs are enclosed by brackets

Number pair (- 2, - 6) representation________ ?

A point whose abscissa is - 2 and ordinate is - 6

-(- a) denotes meaning. Simplify? Simplify the following numbers: - (- 82) - (+ 3.73) - {- [- 7 / 2]}. + {- [19 and 1 / 3]}

-The meaning of (- a) is: the opposite of a number is equal to itself
-（-82）.=82
.-（+3.73）= - 3.73
-｛-【-7/2】｝= - 7/2
+{- [19 1 / 3]} = - [19 1 / 3] = - 19 1 / 3