I really can t think of this question, who sent one for me to refer to? 5

You can start from the aspect of moral kidnapping, giving up seats to the elderly is a socially recognized moral behavior, if you meet the elderly on the bus, the average person will take the initiative to give up their seats, and those who do not take the initiative to give up their seats will be blamed by others. In the picture, two primary school students are sitting on the seat with a big schoolbag on their backs, and a gray-haired grandfather next to them is standing next to him, ** There are many hands painted on the right, all accusing the primary school students of not giving up their seats to the old man, and the primary school students look at each other and their hearts are: I am also very tired, in fact, we are more tired.

I think most people's thoughts on this question may blame primary school students for not giving up their seats to grandpa, but I think there is no fixed angle for this question, you can also start from the aspect of moral kidnapping, and not giving up your seat is an active thing to do, rather than being forced to do it by others.

The original equation can be deformed to (lgx-lg2)(lgx-lg3)=0, so lgx=lg2 or lgx=lg3

Therefore x=2 or x=3, so that the sum of the two is 5

Hope it helps.

Hello, those two are wrong.

After processing with cross multiplication, it should be (lgx+lg2) (lgx+lg3), the two of them write subtraction, you can bring it in to check it to know who is right, so that the value of x1 1 2, x2 1 3, x1+x2 is 5 6.

In fact, if you start from the boss's point of view, the boss receives 25 yuan, then everyone actually pays (25 3 = 3 cycles) yuan, plus the returned 1 yuan, everyone pays 3 cycles, so you use * 3 = 28, plus the waiter's 2 yuan is 30. So in fact, everyone doesn't pay 9 yuan, but this question is here, which makes you really think that everyone spent 9 yuan, but it can't be counted like that.

It feels like this question is like that extra rectangle.

This problem has been a problem for many years, and it is an algorithm problem in summary. The phrase "3 x 9 = 27 yuan + 2 yuan hidden by the waiter = 29 yuan" is problematic in itself. What exactly are these 29?

3*9=27 is the money consumed by these three people, while the waiter's 2 yuan is the money held. It is meaningless to spend money to bless some money. In short, the money spent:

Three people each took out ten yuan = 30 The last money held: one piece for three people = 3 + 2 yuan for the waiter + 25 = 30 for the boss 30=30.

The problem is clear.

Are you sure this is okay? So how do you prove that a tetrahedron is a regular tetrahedron?