This is a math problem for a kid to solve!

If the fourth result is x, then x=(89+97+85+x) 4+6

Solution: The average score of the first three times: (89+97+85) 3 points).

The average score of the four times: 6 3 = 2 (points).

The fourth score is: points).

Assuming the fourth grade is x, there is.

89+97+85+x)/4+6=x

x=

Assuming a grade point average of x, then.

89+97+85+x+6)/4=x

277＝3x

x Fourth time.

Let the fourth result be x, then (89+97+85+x) 4+6=x, and x= is obtained

Solution: The fourth score of Dodole is X points.

then (89+97+85+x) divided by 4=x-6

The solution is x=

Let the fourth result be x from the question: (89+97+85+x) 4=x-6 89+97+85+x=4(x-6) Solve the equation: x=

The fourth score is: points).

The answer is not an integer, the estimation is wrong.

Let the fourth score be x

89+97+85+x)/4+6=x

Calculated: x=98+1 3 is approximately.

The final result is 21 The solution process is as follows:

Connecting the EF, we can first get that the triangle ADG is equal to the area of GEF, and the triangle EFH is equal to the area of BHC.

Let the area of the triangle ADG and GEF be m, and the area of the triangle EFH and BHC be n, because 2AE=BE, so 2 triangle AEF=triangle BEF (area) So: 2(2+m)=5+n;

Similarly: 2(3+n)=7+m;

So m=n=1

Add the area of each regular shape.

Directly place a = -2

b = substitution is fine.

a * b = (-2)^2 - 2*(-2^3- 1)-1/==

Well, you just need to bring it in.

2) 2-(1 2)2-(2(-2 cubic -1*2) divided by (-2-1 2).

The answer is that I don't know if there is a mistake, just bring it in and use a calculator to calculate it, I don't know if your a2 is the square of a, I am like this.

-2-1/2-[2(-6-1)-2]/(-1)=

I've just done it right, give it points.

7 5, the result may be wrong, but the method is very simple, as long as a, b are substituted with -2, 1 2 respectively.

1. x 6a power + x 4a power = 9 + 81x 5a under the cubic root number = 243 under the cubic root number

2. It can be expressed as: The area of a rectangle with a length of 3a and a width of 2a can be expressed as: The volume of a cuboid with a length of 3a, a width of 5a, and a height of b.

A is a scoundrel.

Because if b is false, the opposite conclusion of ab will appear. Only breally. b is true, then a is different from b. So a fake, that is, a scoundrel.

2.Cut at least 17 knives.

Description: cut 6 knives on the length to get the base 5, then cut 5 knives on the width to get the base 4, and then cut 6 knives on the depth to get the base 5 A total of 5 4 5 100 small pieces. As for whether the knife is cut accurately, it's really not my business...

If it's not a square, you can go to her. Hey. You can advise her to cut as small as possible, with a millimeter between each knife...

The final volume is one cubic millimeter... Ha ha.

For other cutting methods, it is impossible to go less than 17 knives. Otherwise, at least one side is red...

Question 1: If B is telling the truth, A and B are different, and if he lies, A is a scoundrel;

If B is lying, A and B are the same, and if he lies, A is still a scoundrel, therefore, whether B is telling the truth or a lie, it means that A is a scoundrel.

Topic 2: Theoretically, the analysis should be cut into 5 5 4 = 100 is the least, at least 6 + 6 + 5 = 17 knives.

The water is full when you put the pebbles in it, and the water drops 5 cm when you take it out, so the water that falls is the volume of the stone.

Pebble volume v=8x8x5=320

If there is some water overflowing, it means that after putting in the pebbles, the volume of pebbles + the volume of water is equal to the volume of the container.

So v + 8x8x(16-2-5) = 8x8x16

So v = 8x8x7 = 448

A 5cm drop in the water surface is calculated from the beginning of "full", not from the original 16cm. The water surface falls because the stone is taken out, which means that the volume of the falling is equal to the volume of the stone. The volume of the descent is equal to 8 8 5 320, and this is the volume of the stone.

First find the volume v1 of the remaining water, and then find the volume v2 of the original water, v2-v1 is the answer.

In fact, there is no need to be so troublesome, directly 8 times 8 times 5 equals 320 is the volume of the stone.

This is too difficult for elementary school students. --N years after graduation.

What is the width of a rectangular container?