If your composition is published in the newspaper, please write idioms to describe your mood at that time

If your composition is published in the newspaper, please write idioms to describe your mood at that time

Ecstatic and elated

Through Lei Feng's story report meeting, I learned a lot about how to be a man and modified the wrong sentences

I'm not sure if I can get rid of it!

Through this story, I understand a lot of truth

"Through this story, I understand a lot of truth." or "through this story, I understand a lot of truth."

If the equation for finding a circle is known as a (- 3, - 5), B (5,1), then the standard equation for a circle with the diameter of line AB is

It can be solved by vector method~
Let a point on a circle be m (x, y),
Then the product of vector Ma and vector MB is 0
That is: (x + 3) (X-5) + (y + 5) (Y-1) = 0
Sorting: x ^ 2 + y ^ 2 - x + 4Y - 20 = 0

Solving equation (0.5x + 2 / 0.3) - x = (0.2 of 0.3 (0.5x + 2)) - 12 of 11

(5x+20)/3-x=3(0.5x+2)/2-11/12
4(5x+20)-12x=18(0.5x+2)-11
20x+80-12x=9x+36-11
-x=-55
x=55

Let m = {x | - 1 ≤ X

M={x|-1≤x

Simple calculation of 7.5 + 2.35-7.5 + 2.5

7.5+2.35-7.5+2.5
=(7.5-7.5)+2.35+2.5
=0+4.85
=4.85

Given the point P (2m-3,3-m), about the point in the y-axis symmetry in the second quadrant, try to determine the value of integer M

It can be seen from the question:
2M-3>0
3-M>0
Solution: 1.5

7 1 / 9 * (1 1 / 2-1 / 8 + 3 1 / 4) * (- 2 1 / 4)

Original formula = 64 / 9 × (3 / 2-9 / 8 + 13 / 4) × (- 9 / 4) = - 16 × (3 / 2-9 / 8 + 13 / 4) = - 24 + 18-52 = - 58

The known function f (x) = 2x, X ≥; X & # 178;, x < 0
Given the function f (x) = 2x, X ≥ 0; X & # 178;, x < 0, then the value of F (f (- 2)) is?

Solution f (- 2) = (- 2) ^ 2 = 4
So f (f (- 2))
=f（4）
=2×4
=8.