A supermarket used 80000 yuan to purchase a batch of "T-shirts" from other places. Due to the good sales, the supermarket urgently allocated 176000 yuan to purchase "T-shirts" which are twice as much as the last time. However, the second purchase price is 4 yuan more than the first purchase price. The supermarket sells them at 58 yuan per piece, and the remaining 150 pieces are sold out at a 20% discount. How much money has the supermarket made in this business (including two purchases)?

It costs 4 yuan per piece. It's the first time to buy it: [(17.6 * 10000 / 2) - 80000] / 4 = 2000 (pieces)
2000 * 2 = 4000 for the second time
58*(4000+2000-150)+58*150*0.8-17.6*10000-80000
=90260 (yuan) = 9026 (yuan)
The supermarket made 90260 yuan

Every day, the supermarket bought back a batch of T-shirts from other places with 50000 yuan. Due to the good sales, the mall urgently allocated 186000 yuan to buy back T-shirts that were twice as much as the first time. However, the second time was 12 yuan more expensive than the first time. The mall sold them at the price of 80 yuan. In order to shorten the inventory time, the last 400 T-shirts were sold out at a discount of 6.5% How much is the profit of the Communist Party of China?

Let x pieces be purchased for the first time, then the number of pieces to be purchased for the second time is 3x. (1 point) according to the meaning of the question, we can get 50000x + 12 = 1860003x. (3 points) solve the equation, and we can get x = 1000. After testing, x = 1000 is the solution of the original equation. The solution of the original equation is x = 1000. (2 points). The number of pieces to be purchased for the second time is 3x = 3 × 1000 = 30

Page 31 question 3, page 32 question 5, fast, in half an hour
38 + 456307 + 348123 + 2847 calculate the following questions and check them with the law of additive commutation

38+456=494 307+348=655 123+2847=2960
38 456 307 348 123 2847
+456 checking calculation: 38 + 348 checking calculation + 307 + 2847 checking calculation + 123
______ ________ ______ ———— ————— _______
494 494 655 655 2960 2960

16/32 15/34 17/33 /35 18/?
Find the law

16\35,18\34

A 500 word composition with the title of "true feelings" or "warmth" should have descriptions of environment, psychology, language and action

1 1 1 1 1 1 1
— + — + — + — +…… + — + —
27 712 1217 1722 9297 97102
The score line is not aligned. Don't just write what method to use. Each one is one to one fractional line, and each one at the bottom is a few * several to one fractional line

Khan, you don't have to go to university in a month. Go back to primary school
Oh, I see. Sum with split terms
1/5^(1/2-1/7+1/7+.-1/102)=1/5^(1/2-1/102)
It seems not right. How is your 1 right

Solving the equation: X divided by 12 + 10 = x divided by 15 + 13

x/12+10=x/15+13
x/12-x/15=3
(5x-4x)/60=3
x=180

How to calculate 102 * 35 simply

102×35
=（100+2）×35
=100×35+2×35
=3500+70
=3570

11. In the parallelogram ABCD, e is a point on the extension line of CD, be and ad intersect at F, de = half of CD
(1) Verification, △ ABF ~ △ CEB
(2) If the area of △ is 2, find the area of parallelogram ABCD
12. In the parallelogram ABCD, be bisection ∠ ABC intersects ad at point E, DF bisection ∠ ADC intersects BC at point F
It is proved that △ Abe is equal to △ CDF
13. In the parallelogram ABCD, ab ⊥ AC, ab = 1, BC = √ 5. For suburban AC, BD intersect at point O, the straight line AC revolves around point O, and intersects BC and ad at points E and f respectively
(1) It is proved that when the rotation angle is 90 degrees, the quadrilateral abef is parallelogram
I'm sorry everyone, because we can't pass the picture up, who can solve it? The reward will be given to 100

1.1）
Because the quadrilateral ABCD is a parallelogram
Therefore, a = C, AD / / BC
Because AD / / BC
Therefore, AFB = CBE
In △ ABF and △ CEB
Because ∠ a = C, ∠ AFB = CBE
So △ Abf ∽ CEB
2）
S parallelogram = 24
2. Because it is a parallelogram
So angle a = angle c AB = CD ad is parallel to BC
Because be and DF are bisectors
So angle Abe = angle EBC = angle ADF = angle FDC
Because angle AEB = angle EBC, angle ADF = angle DFC
So angle AEB = angle DFC
Two corners and one pair of sides are equal
So triangles are congruent
3.1. It is proved that ab ⊥ AC ≁ AB / / EF and AF / / be ≁ quadrilateral abef are parallelogram when the rotation angle is 90 degrees
2. In the process of rotation, the quadrilateral BEDF may be a diamond
Prove that △ AOF ≡ Coe, OE = of Ao = Co ⇽ quadrilateral BEDF is parallelogram
When EF ⊥ AC, the quadrilateral BEDF is a diamond
At this time, the degree of clockwise rotation of AC around point O is 90 degrees

In order to keep the amount of sales unchanged, how many percent of the sales volume should be increased compared with the original price? Note: This is an equation!

Let the price be a, the sales volume be B, and the sales volume increase by X
A*B=A*(1-10%)*B(1+X)
A*B=(1+X)*0.9*AB
X=1/9
X=0.1111……
The sales volume is about 11% higher than the original price

Page 31 question 3, page 32 question 5, fast, in half an hour 38 + 456307 + 348123 + 2847 calculate the following questions and check them with the law of additive commutation

16/32 15/34 17/33 /35 18/? Find the law