About 6xy-4x-y

About 6xy-4x-y

-2x/3y

-The square of 4xy + the square of 4x, the third power of Y + y

-The square of 4xy + the square of 4x, the third power of Y + y
=y(4x²-4xy＋y²)
=y(2x-y)²

Cube of ((2x of square) (y)) / square of ((- 4x of square) (y))

=y³/8x^6×16x²/y^4
=2/x^4y

Can rational numbers be divided into natural numbers, negative integers and fractions?
This is a multiple-choice question, please choose the correct answer: A. rational number is divided into positive rational number and responsible number B. rational number is divided into positive integer, negative integer, positive fraction, negative fraction C. rational number is divided into Zheng rational number, 0, fraction D. rational number is divided into natural number, negative integer, fraction D

A error is less than 0
B is the same as a
C is missing negative integers and negative fractions
D correct
Definition of rational number: positive integer, 0, negative integer, positive fraction, negative fraction can be written in the form of fraction, such a number is called rational number

Given that the solution of equation 5x + 2m = 3x-7 is the same as that of equation 3x + 2m = 6x + 1, the value of M is obtained

3X+2M=3X+3X+1
2M=3X+1
5X+3X+1=3X-7
5X=-8
X=-1.6
M=3x(-1.6)+1
=-3.8

There are 120 ducks and u raised by a specialized farmer. Counting, they have 312 legs. How many ducks and rabbits are there?

Every duck has two legs, and every rabbit has four
Let x ducks and 120-x rabbits
2x+4×（120－x）=312
2x＋480－4x=312
2x=168
X = 84
Rabbits: 120-84 = 36
A: there are 84 ducks and 36 rabbits

lim(x→0)2x^3-x+1

=lim x(2x²-1)+1
Where x →∞, 2x & # 178; - 1 →∞,
So the result is ∞

22… The remainder of 222000 2 divided by 13 is______ ．

Because 222222 = 2 × 111111, = 2 × 111 × 1001, = 2 × 111 × 7 × 11 × 13, 222222 can be divisible by 13 22 000 = 22, 1998, 00 + 22, 22 △ 13 = 1 9, so the required remainder is 9

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15. + 49 how to calculate easily?

Fold up 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15. + 49
The tolerance is 2
The number of items is (49-1) / 2 + 1 = 25
Sum = (1 + 49) x 25 / 2 = 625

How to find the solution of this differential equation: y '= x / y + Y / x, separate variables?

Let u = Y / X
u+1/u=(xu)'=u+xu'
u*u'=1/x
u*du=（1/x）dx
The integral of both sides can be obtained as follows:
1/2u^2=lnx
U = root 2 * LNX
Y = x * radical 2 * LNX