Junior 2 Math! Just one question! Thank you!

First, we prove that BED and DFC are congruent, and DE is equal to DF, and after proving the congruence of AED and ADF, we learn that AB is equal to AC, so it is an isosceles triangle, so AD is an angular bisector.

The temperature in the cold storage of a fruit is -3, and the existing batch of fruits should be stored for another 12, if the temperature can rise by 3 per hour, how many hours can the required temperature be reached?

12-(-3)=15 15 3=5 (hours) Known: a= -one-third , b= -one-half , c = one-quarter, find c of a + b

a+b=-(1 3)+(1 2)=-5 6c (a+b)=(1 4) (-5 6)=-3 10 The final mathematics test results of the first class of the seventh grade are as follows: 6 students in the first group, with an average score of less than 1 point per person in the first group, 7 people in the second group, with an average score of 1 point per person, 6 people in the third group, with an average score of 1 point per person, 7 people in the fourth group, with an average score of less than the average score of each person, and 7 people in the fifth group, with an average score of less than the average score of each half, There are 7 people in the sixth group, and the average score of each person is higher than the average score of the half-term, is the average score of the mathematics test score of this class higher or lower than that of the half-term? How many points is the difference in the total score of the class?

Therefore, the average score of the mathematics test in this class is lower than that of the half-term, and the total score of the class is 7 points different.

Such a simple question is also asked, I rely on the children nowadays are so stupid.

You have three questions here, right?

Question 1: Heating up 3 degrees per hour, find the number of hours, that is, the difference between the target temperature and the current temperature divided by the heating rate is the time, the formula is:

Time = temperature difference Heating rate.

The listed formula is calculated as follows:

12-(-3))/3=?The answer is: 5 (hours) Question 2:

a+b=-(1 3)+(1 2)=-5 6c (a+b)=(1 4) (-5 6)=-3 10 Question 3:

Solution: Let the average half period be divided into x, then.

6*(x-1)+7*(x+

1、-x-2

3. T questions are incomplete.

to the nth power = s mm.

s=n squared n>1

If n=6 then s=64

Thickness: Fold in half 5 times.

I choose DThink more about yourself, and after drawing a picture, you will find that it is not that difficult...

The landlord must adopt a touch of humor kk Oh.

The answer is yes, because it's an isosceles triangle.

The formula obtained = [x (x-1)] under the root number

The formula = (4 times under the root number + 2 times the root number 3 3).

1 3 times the root number under (4 times the root number 3+6).