Xiaosi bought two pencils with 10 yuan, and bought two more stationery, and the money just ran out?

Mechanical pencils and water-based pens.

Formula: 10-(

Let the rubber element be one of them, then: there is no stationery symmetrical with the element.

Let the mechanical pencil element be one of them, then: water-based pen is the element.

So the price of 10 yuan minus two pencils (yuan) is still left, and then buy a mechanical pencil yuan and a water-based pen yuan, and the 10 yuan is just used up.

Xiao Si used 10 yuan and bought two pencils for yuan. So there is still a meta left. The latter problem was to buy two pieces of stationery.

The focus is on two pieces. Mechanical pencil element. The water-based pen is meta.

So it adds up exactly the meta! So the answer is a water-based pen and a mechanical pencil.

Because the pencil is one yuan and two pencil yuan, so after buying the pencil there is a yuan left. Yuan can buy a mechanical pencil and a water-based pen.

The process is as follows: Solution: one pencil element, two pencil elements.

The remaining four of the primary four (yuan.

The remaining yuan of the primary four, a mechanical pencil yuan, and a water-based pen yuan.

Xiao Si bought another mechanical pencil and a water-based pen, and the money just ran out.

The two pencils are exactly yuan, there are 10 yuan, and there is exactly the remaining yuan, so only the mechanical pencil yuan and the water-based pen yuan in the answer coincide, and all the answers are: mechanical pencil + water-based pen!

Buying mechanical pencils and water-based pens just ran out.

Buy 2 more erasers and run out of money.

Question: 10 yuan can buy 1 file box and 2 pens, if you only buy 1 file box and 1 pen, there are 5 corners left. Ask for the pen and the file box.

Analysis: This problem can be solved by equation or calculated directly.

Answer: According to the title, the remaining 5 corners are the ** of the pen.

Then you can find the ** of the file box.

9 (yuan), so the unit price of the file box and pen is 9 yuan and yuan respectively.

Equation solution: set the pen and file box** are m and n yuan respectively, and the equations are listed as follows according to the title.

2m+n=10①

m+n=10－

Get. 2m+n m n=10 (10 m=substitution.

n=10 so the solution of the equation is m=,n=9

So, a pen element, a file box 9 yuan.

According to the title 10 yuan to buy a stationery box and 2 pens is just right, only buy a stationery box and a pen: , there is still a yuan, indicating that a pen is a yuan, and the stationery box is equal to 10-2 * yuan, a pencil yuan, a document 9 yuan.

The second time I bought less than the first, a pencil, and 5 corners left. So a pen 5 jiao (or yuan).

And a stationery box is 9 yuan.

A pencil for 5 dimes. Because 10 yuan is just to buy a stationery box and 2 pencils, and to buy a stationery box and a pen there are 5 corners left, these 5 corners are just the money to buy a pen less

A pencil costs 5 dimes, and a stationery box costs 9 yuan.

Xiaohong bought a pencil and a Qingsui fountain pen for 12 yuan, and the money of a fountain pen can buy 3 pencils. The fountain pen and the pencil answer shout that the pen is more and less money?

Solution: x + y = 12

x=3y4y=12

y=3. x=9.

A: A fountain pen is 9 yuan, and a pencil is 3 yuan.

Because a pen = 3 pencils, and a pencil + a pen = 12, so there is a pencil + 3 pencil = 12, and the solution is a pencil = 12 4 = 3 yuan, so a pen is early to open the pants 3 3 = 9 yuan.

According to the title, 1 fountain pen can buy 3 pencils, so Xiaohong can buy 4 calendar pencils for 12 yuan, each pencil is 3 yuan, so each fountain pen imitation lead is 9 yuan.

The penman makes the pencil 12 yuan.

3 pencils Lee Bureau fountain pen.

3 pencils Pencils 12 yuan.

Pencil $3.

Fountain pen 3 3 which is too much to let 9 yuan.

Xiao Ming brought 14 yuan to buy two pens and a stationery box. If he only buys a fountain pen, there will be ten yuan left, then it means that the ** of a fountain pen is 14-10 is equal to 4 yuan.

When we find out the ** of a fountain pen, it is four yuan, Xiao Ming's 14 yuan, you can buy two pens and a stationery box, then the ** of the stationery box is 14-2 4 is equal to 6 yuan.

Xiao Ming took 14 yuan to buy two pens and a stationery box just to run out of money, indicating that two pens and a stationery box 14 yuan, if only buy a pen and 10 yuan left, indicating that a pen 4 yuan, you can get a stationery box 6 yuan.

Analysis: two pens + one stationery box 14 yuan.

There are only ten yuan left to buy a fountain pen, that is, 14 10 4 (yuan) is the price of a fountain pen, and two fountain pens are 4 + 4 8 (yuan) [or: 2 4 8 (yuan)] and then calculate the price of the stationery box, 14 8 6 (yuan).

Step-by-step: 14 10 4 (yuan) 4+4 8 (yuan) 14 8 6 (yuan).

Comprehensive formula: 14 2 (14 10) 6 (yuan) Answer: 4 yuan for a fountain pen and 6 yuan for a stationery box.

Xiao Ming bought two pens for 14 yuan plus one to stabilize, if there is a pen, there are ten yuan, then one pen is four yuan, then two pens, it is eight yuan, and the stationery box is six yuan, adding up to just 14 yuan.

Fountain pen 14-10 = 4 yuan.

Stationery box 14-4 = 10 yuan.

Then a pen 14-10 = 4 yuan, a stationery box 10-4 = 6 yuan.

14-10 = 4 yuan for a fountain pen.

14-4 2=6 for a stationery box 6 yuan.

1 fountain pen 14-10 4 (yuan).

1 stationery box 14 4 2 6 (yuan).

Step-by-step calculation, if you only buy a fountain pen and have 10 yuan left, you can calculate the **:

14-10=4 (yuan).

Then according to the first condition, you can calculate the **:

14-4x2=6 (yuan).

Answer: The ** of the fountain pen is 4 yuan, and the ** of the stationery box is 6 yuan.

40 yuan can buy pencils 40 4 = 10 or stationery boxes 40 8 = 5 or pencils 8 stationery boxes one, or pencils 6 stationery boxes 2, or pencils 4 stationery boxes 3, or pencils 2 stationery boxes 4 stationery boxes.

How much is a stationery box and a pencil.

4+8=12 (yuan).

12 3 = 36 (yuan).

40-36=4(元.

Pencil: 3 + 1 = 4 (only).

Stationery box: 3 pcs.

Summary. A fountain pen costs 9 yuan.

Xiaohong bought a pencil and a fountain pen for 12 yuan, and the money to buy a fountain pen can buy three pencils and a fountain pen?

A fountain pen costs 9 yuan.

Always a pen, a pencil.

One fountain pen is equal to four pencils all the time.

Pencil $3. Fountain pen 3 * 3 = 9 yuan.

You can buy a pencil case, a homework book: 5 + 3 8 (yuan) you can buy a pencil case, an eraser: 5 + 2 7 (yuan) you can buy a pen, an eraser: 6 + 2 8 (yuan) you can buy a pen, a homework book: 6 + 3 9 (yuan).

Can be bought:

1. Pencil case + homework book = 5 + 3 = 8 yuan.

2. Pencil case + eraser = 5 + 2 = 7 yuan.

3. Homework book + pen = 3 + 6 = 9 yuan.

4. Workbook + eraser = 3 + 2 = 5 yuan.

5. Pen + eraser = 6 + 2 = 8 yuan.

5+3=8 pencil case and workbook.

5+2=7 pencil case and eraser.

6+3=9 pens and workbooks.

6+2=8 pens and erasers.

As long as you don't buy a pen and a pencil case at the same time, you can buy any two other combinations.