How to calculate this math problem

Because the money used to buy things is not the same thing as the rest of the money, the money to buy things does add up to 50 yuan (that is, the original money in hand), and the original money in hand can only be calculated with the remaining money can only be 30 plus 20 to buy a sympathy, because this 30 yuan already contains the following 15 yuan and 6 yuan, and the addition of 30 and 15 and 6 is equal to the repeated addition of 15, 6 These two numbers, and also missed the 20, 51 of buying a T-shirt is just a coincidence, and it has nothing to do with 50.

The remainder is denoted by y; y1=50-20;y2=50-20-15;y3=50-20-15-9;y4=50-20-15-9-6;

y1 + y2 + y3 + y4 = 50 * 4 - (T-shirt) * 4 - (slippers) * 3 - (candy) * 2 - (food) * 1

It's supposed to be 51, and it has nothing to do with 50.

Behind is the remaining money, which adds up to meaningless, and if you buy it a few more times, it will add up to a different amount, just cleverly getting the result to 51.

Such calculations are obviously unreasonable, no one has ever said that the money spent will be equal to the amount of money remaining, and the algorithm itself is incorrect.

If the remaining side can't be added, it should be bought and the surplus add up to the last surplus.

The total amount of money bought cannot be equal to the amount of money left at a time.

Three pairs of shoes are 30, so one pair of shoes is 10, one pair of shoes is bai5 Two people plus one pair of shoes are 20, so two people.

zhi is dao10, one person is 5 four bouquets plus one person is 13, so four bouquets of flowers are 8 and one bouquet is 2. The point is that the last person wore a pair of shoes, and touching two bouquets of flowers was counted.

So the answer is 5+(5+10+4)*2 43

The answer is 0, the middle term, the root number 2 minus 1 to the power of 0 is 1, 2sin45 = root number 2, the root number 2 plus 1 to the negative 1 power denominator is the root number 2 minus 1 after rationalization, merge, the answer is 0

A pair of shoes: 30 3 = 10

A small person: (20-10) 2=5

One ice cream: (13-5) 4=2

The villain wears shoes and takes ice cream, so the multiplication answer is 38, as for the front shoe, who is willing to sell you a shoe alone? So the answer to this question should be 48 at the end

A pair of shoes is 30 3 = 10 and one shoe = 5

One person = (20-10) 2 = 5

Two ice creams = (13-5) 2 = 4 One ice cream = 2 then the final result is 5 + 5 * 2 = 15

43, look at the details, the last line of the person also wore shoes and took ice cream.

A pair of shoes: 30 3 = 10

A small person: (20-10) 2=5

One ice cream: (13-5) 4=2

Result: 5+5x2=15

It is not possible to determine the format of the question.

Solution] x+y=7 ==> y=7-x

Substitut xy=2 to get it.

x²-7x+2=0

The solution yields x1=(7+ 41) 2,y1=(7- 41) 2x2=(7- 41) 2,y2=(7+ 41) 2

Using Vedica's theorem in reverse, xy is seen as the root of t 2-7t + 2 = 0. The solution is x=(7+root41) 2, =(7-root41) 2, or the two.

48 degrees 39 minutes + 67 degrees 31 minutes.

48 degrees + 67 degrees) + (31 minutes + 39 minutes) = 115 degrees + 70 minutes.

116 degrees 10 minutes.

21 degrees 17 minutes times 5

21 degrees times 5 + 17 minutes times 5

105 degrees + 85 minutes.

106 degrees 25 minutes.

=(86+1)×88/86

You should know what to expect.