The first equation calculation! Pay attention to the process （1）5+（x-15）/1.5=x/3+10

The first equation calculation! Pay attention to the process （1）5+（x-15）/1.5=x/3+10

5+（x-15）/1.5=x/3+10
Multiply both sides by three, and you'll get three
15+2（x-15）=x+30
15+2x-30=x+30
2x-15=x+30
x=45

2-(1+X)/4=（2+3X）/6-X

2-(1+X)/4=（2+3X）/6-X
Multiply both sides by 24
48-6(1+x)=4(2+3x)-24x
48-6-6x=8+12x-24x
12x-6x=8-42
6x=-34
x=-17/3
Do not know, welcome to ask

The canteen has several tons of coal. It used to burn 3 tons of coal every day. After 15 tons of coal was used, it was improved and not prepared. The coal consumption was reduced to half of the original. As a result, it burned 10 days more and the original coal storage was calculated

Suppose the original coal storage is x tons, from the Title Meaning: 153 + X − 1532-x3 = 10, finishing: 15 + 2x-30-x = 30, solution: x = 45 (tons), answer: the original coal storage is 45 tons

A mathematical problem. Use equation to solve, write out the process
A company purchased 1600 cubic meters of poplar in Suqian, the hometown of Italian poplar in China. It plans to complete the processing task of this batch of poplar in 20 days. It is known that the company can finish processing 50 cubic meters of poplar or rough processing 100 cubic meters of poplar every day
(1) How should the company arrange the number of days for finishing and rough machining in order to complete the task on schedule?
(2) If the profit of each cubic meter of poplar after finishing and rough processing is 500 yuan and 300 yuan respectively, how many yuan will the company get from selling the processed wood?
Solving linear equation with one variable

1. Set finishing X days
50x+100(20-x)=1600
x=8
20-8=12
2.8*50*500=200000
12*100*300=360000
200000+360000=560000

In the cube abcd-a1b1c1d1, where e is the midpoint of dd1, the positional relationship between BD1 and the plane passing ace is ()
A. Intersection B. parallel C. vertical D. line in plane

Connect AC and BD, the intersection point is f, and connect EF ∵ in △ bdd1, e and F are the midpoint of dd1 and BD, so EF ∥ BD1, ∥ EF ⊂ plane ace, BD1 ⊄ plane ace, ∥ BD1 ⊂ plane ace, so select B

The second and fourth idioms contain numbers

Ding Yimao Er Ding: through the "nail", here refers to the tenon; Mao: tenon holes on the utensils. Ding Maohe position, a trace of good. Description is true, reliable. Ding Yimao Er is clear, true. Unique, there is no same or comparable

If a chord is divided into two parts, one of which is twice as large as the other, the degree of the circumference angle of the chord

Because a string is divided into two parts, one of which is twice as big as the other,
Therefore, the arc degrees of the two sections are 120 ° and 240 ° respectively
Then the center angles of the circles are 120 ° and 240 ° respectively,
The circumferential angles are 60 ° and 120 ° respectively

How to solve the equation of 6.5x-x = 22

6.5x-x=22
5.5x=22
x=4

Given the diagonal AC = 8 and BD = 12 of the parallelogram ABCD, the value range of the side length ab of the parallelogram should be

A quadrilateral ABCD is a parallelogram
Let AC and BD intersect with point o
The AC and BD are divided equally
∴AO=CO=(1/2)AC=(1/2)*8=4
BO=DO=(1/2)BD=(1/2)*12=6
In △ AOB, if Ao = 4 and Bo = 6, the value range of AB is 6-4

X-7 / 15x = 12 / 25

8x/15=12/25;
x=9/10
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