[it is required to write clearly the process and test process of equation solution] 4x = 24 y △ 6 = 42 5x = 7.5 x-1.23 = 15.09 0.7x = 50.510.1x = 50.5 490 △ x = 5 25 △ x = 5 12.6 △ x = 6

4X=24
X=24÷4=6
Test 4 × 6 = 24
Y÷6=42
Y=6×42=252
Test 252 △ 6 = 42
5X=7.5
X=7.5÷5=1.5
Test 5 × 1.5 = 7.5
X－1.23=15.09
X=1.23+15.09=16.32
Test 16.32-1.23 = 15.09
0.7X=50.5
X = 50.5 △ 0.7 is about 72.14
10. 1X=50.5
X=5
490÷X=5
X=98
25÷X =5
X=5
12.6÷X=6
X=2.1

(3x-1) ^ 7 = a ^ 7x ^ 7 + A ^ 6x ^ 6 + A ^ 5x ^ 5 +. + A ^ 1x + A ^ 0, then a ^ 7 + A ^ 6 +. A ^ 1 + A ^ 0 =?

Let x = 1
Left = (3-1) ^ 7 = 128
On the right, any power of 1 is 1
So the right side is a ^ 7 + A ^ 6 +. A ^ 1 + A ^ 0
So a ^ 7 + A ^ 6 +. A ^ 1 + A ^ 0 = 128

The solution equation: 1, 3 / 4x-35 = (x-56) × 4 / 3 2, 5 / 6x + 2 / 3 (204-x) = 152
3. Suppose the retail price is x yuan per kilogram, and the total purchase price is y kg, (0.84y + 200 × 1.2y/1000) × 0.25 = (x-0.84) 0.9Y
4、4/7x-100=3/7x+100
5、1.25x×0.8=64
6、1/4x+2/5（180-x）=60
7、12×0.1=（12-x）×0.12
8、16+x=20×0.9
Hurry up. It's going to be tonight. Don't forget,)

13 / 4x-35 = (x-56) × 4 / 38 / 3x = 224 / 3 + 56x = 4925 / 6x + 2 / 3 (204-x) = 152x / 6 = 152-136x = 963 incomplete condition 44 / 7x-100 = 3 / 7X + 100 x / 7 = 200X = 140051.25x × 0.8 = 64x = 6461 / 4x + 2 / 5 (180-x) = 60 3 / 20x = 12x = 80712 × 0.1 = (12-x) × 0.120.12x = 1

Extracting the real part and imaginary part of complex number by MATLAB symbolic operation
syms a b
>> f=a+b*i
>> real(f)
ans =
real(a + b i)
Why isn't the answer a?

Syms a B real% create a real signed variable
F = a + I * B;% create Z as a complex signed variable
real(f)

There is an 82 page book, but there is one missing in the middle. Xiao Hong added up the pages of the remnant book to 3314. She asked Xiao Hong how she miscalculated and how much it should be?

Xiaohong's calculation is wrong of course, so the page number is 1 + 2 + 3 + 82 = n / 2 × (n + 1) = 82 / 2 × (82 + 1) = 3403, 3403, 3403-3314 = 8989 = 44 + 45. Therefore, pages 44 and 45 are missing, while pages 44 and 45 are on two sheets of paper respectively. Therefore, Xiaohong is wrong. It should be 3403 - (43 + 44) = 3316 or 3403 - (45 +)

The difference between sport and sports

First of all, their parts of speech are not the same. Sport can have noun, verb and adjective parts of speech, while sports only has adjective parts of speech. When sport is an adjective part of speech, it is usually in the form of plural ~ sports ~

In the triangle ABC, angle c = RT angle, AC = 4cm, BC = 5cm, point D is on BC, and CD = 3cm. There are two moving points P and Q starting from point a and point B at the same time,
The middle point P moves to the end point C along AC at the speed of 1cm / S; the point Q moves to the end point C along BC at the speed of 1.25cm/s; PE / / BC crosses point P to point E and connects Eq. the movement time of the set point is x seconds
(1) The length of AE and De is expressed by the algebraic formula containing X;
(2) When x is a right triangle, EDQ is a right triangle

∵PE//BC ∴PE⊥AC
Also ∵ △ ape ∽ ACD
AP=X CD=3 AC=4
∴AP/AC=PE/CD
∴PE=AP*CD/AC=3X/4
In RT △ Ape:
AE=√(AP^2+PE^2)
=5/4X
Because:
AD=√(AC^2+CD^2)=5
So:
DE=AD-AE=5-5/4X
(2) Only when QE / / AC, i.e. QE ⊥ BC is satisfied, △ EDQ is a right triangle
∴△DEQ∽△DAC
∵QB=X
∴DQ=QB-DB=X-2
From DQ / DC = de / DA, it can be concluded that:
That is: X-2 / 3 = 5 - (5 / 4x) / 5
The solution is x = 20 / 7
So when x = 20 / 7, △ DEQ is a right triangle

(common factor and greatest common factor 44
If there is a basket of apples, no matter whether it is given to 4, 5 or 6 children, there are 2 more. How many apples are there in this basket?

We can know from the title: whether the number is divided by 4, 5 or 6, the remainder is 2, so the number should be the common multiple of 4, 5 and 6 + the common multiple of 2, 4, 5 and 6 is 60, that is, there are 62 apples in this box

If the area ratio of two similar triangles is 1:4, then their perimeter ratio is ()
A. 1：2B. 1：4C. 1：5D. 1：16

∵ the area ratio of two similar triangles is 1:4, their similarity ratio is 1:2, and their perimeter ratio is 1:2

The greatest common factor of two numbers is 20 and the least common multiple is 240. It is known that one number is 60 and the other is ()

Because the greatest common divisor is 20, these two numbers must be multiples of 20. Starting from one, only when 20 is four times (80), their least common multiple is 240

[it is required to write clearly the process and test process of equation solution] 4x = 24 y △ 6 = 42 5x = 7.5 x-1.23 = 15.09 0.7x = 50.510.1x = 50.5 490 △ x = 5 25 △ x = 5 12.6 △ x = 6