Asking for help, the solution of a math problem in the first year of junior high school, to the proc

In the same way, let x+95 2111=0, then x=100 211, in the same way, let x+95 2111=0, then x=-95 2111 means that this equation can be seen as the sum of the distance from a point on the number line to 100 211 and the distance to -95 2111, then we can find that the minimum value is the point between the two values, and the minimum value is (95 2111+100 211).

I guess 95 2111 should be 95 211! But it's okay, the method is the same, just follow your original question!

x-100 211 represents the distance from point x on the number line to point 100 211.

x 95 2111 represents the distance from point x to point -95 2111 on the number line.

So x-100 211 x 95 2111 represents the sum of points x to 100 211 and -95 2111.

When-95 2111< x < 100 211, the distance is the shortest, i.e., the minimum value is 100 211 - (-95 2111) = 100 211 + 95 2111< p>

You didn't make a mistake, such a strange number.

Draw the number line to find the point x so that the distance from x to point a (100 211) and point b (-95 2111) is minimized.

So the result is 100 211-95 2111, where x is any point between a and b.

Let's buy x bars of soap, x 2.

Type 1: 2+2(x-1)* i.e.

The second type: 2x* i.e.

If you get the same discount, then:

x 5 The first option and the second option get the same discount, and you need to buy 5 bars of soap.

Set up to buy x blocks, the first type: 2+2

The second type: 2, according to the meaning of the title:

x=5 means that when you buy 5 yuan, the discount is the same.

If the first method gets the same discount as the second method when buying x bars of soap, then 2+(x-1)*2*

x = 5, i.e. when buying 5 bars of soap, the first method gets the same discount as the second method, I will explain it to you:

2+(x-1)*2*

The first preferential method is that the first piece is calculated according to 2 yuan, and the subsequent ones are sold according to 75% off. So the first piece of ** is 2 yuan + the next few pieces of **. Because the first block has been added, the number of the next few pieces is (x-1), and the ** of the next few pieces is seventy-five percent off the original price, so 2*, so the ** of the first plan is 2+(x-1)*2*

The second easy to understand is 2*

It represents the multiplication sign, because it is similar to the unknown number x, so I am afraid that you will be confused.

Because the water level reached the warning level last weekend, the water level last weekend was meters, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday.

The change in water level in meters gives the actual water level in meters.

So: the highest water level on Tuesday of this week is + meters away from the warning water level, and the lowest water level is week and the distance from the warning water level is meters.

Compared to the water level last weekend, the water level has risen and fallen this weekend by meters.

So compared to the water level last weekend, the water level rise and fall this weekend is rising.

Wan must be returned.

The rest is interest, there is no in the first year, 9 in the second year, and in the third year, then the interest in the nth year is (

Answer: If you still need to repay in the nth year, you should repay 10,000 yuan in the nth year.

One year is less, so n years are less n.

Solution 1, if a 0, b 0, then |a+b|=-a-b，|a|+|b|=-a-b，|a|-|b|=-a+b

Obviously|a|-|b|＜|a+b|=|a|+|b|If a 0, b 0, then |a+b|=-a-b，|a|+|b|=-a+b，|a|-|b|=-a-b

then |a+b|=|a|-|b|＜|a|+|b|If a 0, b 0, the result is as above.

If a 0, b 0, then |a+b|=|a|+|b|=|a|-|b|The results are all 0

2. Set 1+2+2+2 to the 63rd power = s then 2 + 2 +2 to the 64th power = 2s

2s-s = 2 to the 64th power -1

3. Let a, b, and c be 1

x=6 6 to the 19th power + 99*6+2000=14th power.

1. A and b are rational numbers, and judgment |a+b|、|a|+|b|、|a|-|b|relationship.

2. Why is 1+2+2 squared + 2 cubic+....+2 to the power of 63 = 2 to the power of 64 - 1? Write out the calculation process.

3. The rational numbers a, b, and c are not 0, let x= |a|/b+c+|b|/c+a+|c|a+b to the 19th power of x + 99x + 2000.

You can do it for me.

Because (3a+8b)x+7=0 has no solution.

So 3a+8b=0

a=0 b=0 or a>0 b<0 or a<0 b>0, so ab=0 or ab<0

So ab is a non-positive number.

This question is a choice, right?

I've seen it, and I seem to have forgotten to choose b.