It s almost time to go to school, and there are some small questions that I won t do in the winter v

Only going to school now?

The diagonal is 17 long, and the bottom side is 10 and 20 long

If you do high, you can get a high of 8

So s = 30*8 2 = 120

The integer part of root number 32 is a, and the integer part of root number 5 is b so a=4, b=2 so a+b=6

sqrt(6) -1 / 3) *sqrt(3)) 1 / 2) *sqrt(8)))2) *sqrt(6) =

x^3-3x-2=0

x^3+x^2-x^2-3x-2=0

x^2(x+1)-(x^2+3x+2)=0x^2(x+1)-(x+1)(x+2)=0x+1)(x^2+x+2)=0

Because (x 2+x+2) is a non-real number, x=-1

2 and 4 are the roots, so that is.

x+2)(x-4)=0

Simplification yields x 2-2x-8 = 0

3) 2 times the root number 2 plus 4 times the root number 3 minus 12=

4)x^3-3x-2=0

x^3+1-(3x+3)=0

x+1)(x^2-x+1)-3(x+1)=0x+1)(x^2-x-2)=0

x=-1 or x=2

5)x~2+2x-8=0

Upstairs is too careless, especially the symbols in question 4.

2. a+b=9+2＝11

3.2 root number: 2+4 root number: 3-12

4. x=2

5.The square of x-2x-8 0 is made using Veda's theorem.

Solution: Let's say they meet in x minutes.

47x-35x=42 47*12x=42 =

x=42 12 =287 (m) x= A: A and B are 287 meters apart.

Because Xiao Ming is 35 meters per branch and Xiao Hua is 47 meters per branch, Xiao Hua walks 12 meters more than Xiao Ming per minute.

42 12 = minutes).

322 (m).

With the formula: distance difference speed difference = time.

The difference in velocity, i.e. 47-35 = 12 (meters).

Distance difference Speed difference = time.

i.e.: 42 12 = minutes).

Then use the formula: speed and time = distance and sum.

i.e.: (35+47) m).

A: A and B are 287 meters apart.

1、k=-1

2. Let the total number be x, and the first time left: x-x 2-1;Second time left: (x 2-1) 2-1;

The third time left: [(x 2-1) 2-1] 2-3=0 solution x=302, if you can push it backwards, it is relatively simple, the last time is the remaining half and three, that is, the second time is left after the second division, the second time is (6 + 1) * 2 = 14, the first time is (14 + 1) * 2 = 30

Is it a question of the first year of junior high school, it is some basic things, and you have to study hard.

1.Because the xy term is not included, -7kxy-7xy=0.

i.e. (-7k-7)xy=0, -7k-7=0, so k=-12Suppose there are x oranges.

x=30

3.Red: 1 Blue: 3 Yellow: 2 Green: 6.

Times. If you need to explain, just hi me.

All right, guaranteed.