For a piece of clothing, the merchant sells it at a price of 150% higher than the cost price, and then launches the sales activity of "clearance sale". He sells it at a discount of 70% of the price. As a result, he still earns 150 yuan. What's the cost price of the clothing My friend, I'm sorry I don't have any points

For a piece of clothing, the merchant sells it at a price of 150% higher than the cost price, and then launches the sales activity of "clearance sale". He sells it at a discount of 70% of the price. As a result, he still earns 150 yuan. What's the cost price of the clothing My friend, I'm sorry I don't have any points

Let cost be X
250%x*70%=150+x
x=200

① If the value of 3a-b is 5, then the value of 22b-6a + 5 is ()
② As shown in the figure, the 50cm wide rectangular pattern is composed of 10 congruent small rectangles, one of which has an area of ()
③ The first day of the three days is () if the sum of the three numbers is 33

The first question is 40. To tell you the truth, I didn't work it out, but because it's a fill in question, I'll teach you a simple way to bring in a = 2, B = 1 and get the result. Or a = 3, B = 4
33 / 3 = 11, so the median is 11

Solution equation: 5x-2 * 8 = 19

5x - 16 = 19
5x = 19 + 16
5x = 35
x = 35 ÷ 5
x = 7

The area of a triangle is 10.5dm less than that of a parallelogram with the same base and height. The area of a parallelogram is () DM, the surface of a triangle

The area of a parallelogram is twice that of a triangle with equal base and height
Parallelogram area = 21
So triangle area = parallelogram area / 2 = 10.5

1 / 1998 by 1999 + 1 / 1999 by 2000 +. 1 / 2005 by 2006 + 1 / 2006
Urgent!

1/（1998×1999）+1/（1999×2000）+.1/（2005×2006）+1/2006
＝（1／1998－1／1999）＋（1／1999－1／2000）＋…… ＋（1／2005－1／2006）－1／2006
＝1／1998

As shown in Figure D, e are the points on AB and AC in triangle ABC. Given that triangle ade is similar to triangle ABC, ad = one third BD, de = 2cm. Find the length of BC

When de / / BC, because ad = 1 / 3bd, let ad be x, then BD = 3x, ab = 4x can be obtained
Ade is similar to triangle ABC, so ad / AB = de / BC, = x / 4x, because de = 2cm, so BC=
8cm

Given a + B + C = 1, a + B + C = 1, a > b > C, prove - 1 / 3

Note that a ^ 2 + B ^ 2 > [(a + b) ^ 2] / 2
That is, a ^ 2 + B ^ 2 = 1-C ^ 2 > (1-C) ^ 2 / 2
3c^2-2c-10
Then 1 > a > b > C > 0
a^2+b^2+c^2

A 1.5m wide path is built around a circular flower bed. The diameter of the known outer circle is 10m, and the area of the path is calculated

Outer circle radius r = 10 / 2 = 5m
Flower bed radius r = 5-1.5 = 3.5
The area of the small road s = the area of the big circle - the area of the campus = π R & # 178; - π R & # 178; = 3.14 × 25-3.14 × 12.25 = 40.035m & # 178;

The interval of the roots of equation lgx + x-3 is? A (1,2); B (5 / 2,11 / 4); C (9 / 4,5 / 2); D (3,13 / 4)

B

Today, there is a bamboo pole and a rope. The rope is 4 meters longer than the bamboo pole. After the rope is folded in half, it is 2 meters shorter than the bamboo pole. How long are the bamboo pole and the rope?
Please write out the formula

If the bamboo pole is x meters long, the rope will be (x + 4) meters long
0.5（X＋4）＝X－2
0.5X＋2＝X－2
2＋2＝X－0.5X
4＝0.5X
X＝8
X＋4 ＝8＋4＝12
A: the bamboo pole is 8 meters long and the rope is 12 meters long
This problem seems to be a problem in the summer homework of grade five in primary school. Now I will send the solution of grade five to you