Ask me about two elementary school math questions, two questions about elementary school math proble

1. Wrong, the quotient remains unchanged, but the remainder expands by the same multiple, in addition, the meaning of decimal division is not the same as the meaning of integer division, and the remainder division will not be used.

2. No, the definition of multiple is that a number contains several other numbers, which means that this number is several times of another number, in fact, at a higher level of knowledge, times is the ratio of two numbers, or the ratio of two units of the same quantity, this ratio has no unit, or the unit is divided in the process of division.

For example: 20 grams: 10 grams = 20 grams divided by 10 grams = 2, there are no units.

The third question presented by my friend is correct for you to solve it this way, and you will find it after calculating and verifying it.

However, in order to cultivate students' good study habits, today's primary school teachers generally require students to convert units first.

Regarding that true/false question, it is easy to understand an example, such as:

31/10=3……1 The dividend and the divisor are enlarged by a factor of 10 at the same time.

310/100=3……10, the quotient remains the same, but the remainder changes.

1) Wrong, can be checked, if, and 3*, so wrong.

2) Yes, this is equivalent to the problem of fraction rate.

3) Yes, this is a proportional problem.

Wrong, yes, but 37 12≠3

Don't bring double, but it's not wrong to bring it, our teacher has always said that you don't need to bring it, why did I forget it, hehe!

That's right. It's a proportional math problem!

1. A: Yes, because when the dividend and the divisor expand or decrease by the same multiple at the same time, the quotient does not change. (The nature of division).

1. A: No, because"times"It doesn't count as a unit.

1. No, obviously, when your divisor and the dividend are enlarged at the same time, the quotient does not change, which is not wrong, but your remainder will also expand at the same time.

2. No need to bring times

Dizzy, you can figure it out for yourself to know that 1 is right.

2.Correct, multiples are not units.

3.Correct, this is a proportional problem.

1 pair. The prenumerator and denominator are multiplied by one hundred. Divide again.

2 Don't. I don't know why, but I don't want it anyway.

That's right, but 37 12≠3

No need to bring doubles.

The first question is correct. The second question is not, because multiples do not need units"times"I don't do it either.

For the first pair, the division expands or shrinks the same multiple at the same time, and the quotient is inconvenient.

The second one does not need to be doubled.

The answer is the same, but the order is different, anyway, it's a peer operation, and it has no effect.

The answer should be the same, I hope it can help you.

The maximum width is 3+2+2=7, which means that a small tree needs to be cut with 7x15 paper to cut out. So:

Use a piece of handmade paper with a length of 45cm and a width of 21cm, the title is 45m, it should be 45cm, because the total area of the paper: 945 square cm).

Therefore, 3x3=9 sheets of 15x7 paper can be cut, so a piece of handmade paper with a length of 45m and a width of 21cm can cut 9 such small trees.

945 square centimeters divided by square centimeters is about 15

2+3+3=6cm

6+3+3+3=15cm

45 15 = 3.

21 6 3 pcs.

3 3 = 9.

Both of them were wrong and should be done.

(1) Factoring the original formula yields:

x^2+y^2-xy+2x-y+1=（x+1）²-y（x+1）+y²=（x+1）（x+1-y）+y²=0

again y >=0

y=0 and x+1=0, or y=0 and x+1-y=0 can be summed to get x=-1, y=0

2) Discuss the value of a

When a=0, the equation for "1" is -x+1=0, and x=1 is a!When =0, the equation of "2" can be decomposed into (ax-1)(x-1)=0, and the solution is x=1 a or x=1

In summary, the solution of the original equation is x=1 a or x=1