2-1 / 4x = 3

2-1 / 4x = 3

Using the properties of equation to solve equation 9-1 / 4x = 15 and test

9-1 / 4x = 15 and tested
9-x/4=15;
x/4=9-15;
x/4=-6;
x=-24;
Inspection:
X = - 24; left = 9-1 / 4 × (- 24) = 9 + 6 = 15;
So left = right;
So x = - 24 is the solution
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Grade 8 Volume 2 mathematics book PEP 16.3 page 32 question 1 and question 3 2 / 2x-1 = 4 / 4x x 4x-1
Urgent elder brothers and sisters

Multiply both sides by (2x + 1) (2x-1)
2（2x+1）=4
4x+2=4
x=0.5
Test: when x = 0.5, (2x + 1) (2x-1) = 0
5 is not the solution of the equation
The original equation has no solution

It takes eight minutes for Party A, six minutes for Party B, and five minutes for Party C to manufacture a part. At present, the manufacturing tasks of 1180 parts are assigned to three of them, and the requirements are the same

At the same time, the minimum common multiple of? 5, 6 and 8 is 120. In 120 minutes, a completes 15, B completes 20, C completes 24, and three people complete 24 + 20 + 15 = 59, which takes 1190 / 59 = 20 120 minutes. That is to say, it takes 1440 minutes, a completes 300, B completes 400, C completes 480

What is x of 6.5 + 7x = 5.4? We need to solve the equation

The X of 6.5 + 7x = 5.4 is unknown
6.5+7x=5.4
6.5+7x-6.5=5.4-6.5
7x=-1.1
x=11/70

A batch of grain is stored in warehouse A and warehouse B, and the inventory of warehouse a accounts for 11 / 20 of the total. If 42 tons are taken out from warehouse A
If it is put into warehouse B, the grain stored in warehouse B is 1.2 times of that in warehouse A. how many tons of grain are stored in warehouse A and warehouse B respectively?

1÷（1+1.2）=5/11
Total: 42 ÷ (11 / 20-5 / 11) = 440 tons
A: 440 × 11 / 20 = 242 tons
B: 440-242 = 198 tons

Solving equation [5 steps needed]
1. Remove the denominator 2. Remove the brackets 3. Move the items 4. Merge the similar items 5. Change the coefficient of the unknowns to I
1.0.8x+{10-x}=9
2.6x-3{11-2x}=-1
3.3{x-3}-2{1+2x}=6
4.8{3-2x}=4{x+1}
5.5x-1/8=7/4
6.x+5/5=3-2x/3
7.1/7x+16=1/2
8.3y+12/4=2-5y-7/3
9.4{x-1}-3{20-x]=5[x-2]
10.1/5[x+1]=1+1/3[x-2]
11. The sum of 1 / 3 of a number and the smallest positive even number equals 1 / 2 of the number
12.3/4-5x=5/6-2/3x
13.x/0.7-1.7-2x/0.3=1
14.5/4[4/5{1/2-3y}-4/25]=1-y
15. It is known that equation 3 [X-2 {x-a / 3}] = 4x and equation 3x + A / 12-1-5x / 8 = about X have the same solution. Find the value of a and the same solution
It's OK not to write those processes
But how did you get it all

1.0.8x + (10-x) = 98x + 100-10x = 908x-10x = - 10-2x = - 10x = 52.6x-3 (11-2x) = - 16x-33 + 6x = - 16x + 6x = 3212x = 2.6666 3.3（x-3）-2（1+2x）=63x-9-2-4x=63x-4x=6+9+2-x=17x=-174.8(3-2x)=4(x+1)...

Fill in the blanks 26-6, first calculate [] -] = [], then calculate [] -] = []

6－6＝0
20－0＝20

Let the sequence satisfy an = 1, A2 = 2, an = 1 / 3 (an-1 + 2an-2) (n ∈ n * and N ≥ 3), 1. Prove that the sequence an + 1-an is an equal ratio sequence
2. The general term an of the ball sequence an

In order to distinguish the subscript, I use an instead of your an. According to the meaning of the title, there are 3an = a (n-1) + 2A (n-2) and subtracting 3A (n-1) from both sides at the same time to get 3an-3a (n-1) = - 2A (n-1) + 2A (n-2)

7 / 29 * 3 / 8 + 6 / 29 * 7 / 12 + 3 / 29 * 7 / 9
7/29*3/8+6/29*7/12+3/29*7/9
1/3+1/15+1/35+1/63+1/99

7/29*3/8+6/29*7/12+3/29*7/9
=7/29*3/8+7/29*6/12+7/29*3/9
=7/29*(3/8+1/2+1/3)
=7/29*(9/24+12/24+8/24)
=7/29*29/24
=7/24
1/3+1/15+1/35+1/63+1/99
=1/1*3+1/3*5+1/5*7+1/7*9+1/9*11
=1/2*(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11)
=1/2*(1-1/11)
=1/2*10/11
=5/11