Arithmetic, help, help with math problems?

Because the calculation method is wrong!

3 * 9 = 27 yuan already includes the 2 yuan taken by the waiter, why add it!

So don't get out of the way!

This is when the questioner confuses the answerer by stealing concepts, and asks you to point out the mistakes in the question to score points.

The 3 people who stayed took 30 yuan to stay, and the boss only charged 25 yuan for a discount. Note that the accommodation fee is 25 yuan, not 27 yuan. When calculating, the three people who stayed in the hotel thought that the accommodation fee was a total of 27 yuan because they returned 1 yuan each, which in itself did not correspond to the facts, and the result of continuing to calculate according to the way he gave this error was meaningless.

So if you want to ask where the 30 yuan went:

If you ask how much did the accommodation cost:

Question: 10-1=9

Note that the 9*3 in this formula is considered to be the accommodation fee spent, plus the waiter's 2 yuan, it is impossible to use the 9*3+2 formula to restore the whereabouts of 30 yuan, because the premise is already wrong. Satisfied.

Hello, don't buy shoes first, after you borrow money, first take out thirty, put the rest of the nine hundred and seven in your pocket, and then give your parents ten yuan each and keep ten yuan for yourself, then you owe your parents four hundred and ninety yuan each, adding up to nine hundred and eighty yuan, and you yourself are exactly ten yuan in the pocket of nine hundred and seven, exactly nine hundred and eighty yuan. Then you go and buy shoes. There is no such thing as the ten pieces you are talking about.

In the end, you should not add your own 10 yuan, but 10 yuan for your father and 10 yuan for your mother. The problem is actually a list of duplicate money that confuses people and makes it difficult to figure out which ones should be added.

As a result, the borrowed money is 490 490 = 980 I bought a pair of leather shoes and used 970, and the borrowed money - the money used = the rest of the money 980-970 = 10, so what you have left is 10 yuan. or borrowed money - remaining money = money used 980-10 = 970

Wrong 490 490=980 is the last money you borrowed. The sum of the 980 cannot be added to the remaining 10 yuan to verify whether it is equal to the original 1000 yuan, and the quantity relationship is not established.

The rest of the money is on your own.

Original number (1 + percentage of commission) = result of becoming. The last one of them is wrong. The rest:

4000 (Shenchang 1+50%) judgment filial piety = 4000

1/6 x 2/3 (4/5 - 8/15) = (5/12) 1/2 - 3/8) 1/15 = (15/8) 1/3 x 4/5 x (1-9/16 = (7/60) 1/2 + 2/3) 5/6 = (7/5) 11/12 + 15/18) 3/7 = (49/12) 11/12 - 3/4) (1-1/2) = (1/9).

1) 5/12 (2) 15/8 (3) 7/60 (4) 7/5 (5) 49/12 (6) 1/9

5 out of 5 15 out of 15

7 out of 7 7 out of 7

1 out of 49

It's too evil, who came up with the question ......

It can be seen that this law is:

x,y)=x/y+1

x，1/5)=x/(1/5)+1=5x+1=4=>x=3/5

To make 8 x meaningful, then x ≠ carry respect 0, and be cautious.

Multiply both sides of the equation by x at the same time to get -8=-x 2+2x, shift the term to get x 2-2x-8=0, and decompose the mountain mass formula to get (x-4)(x+2)=0, so x=-2 or x=4