Equations: {x = Y-2 {Z-Y = 3 solution XYZ

Equations: {x = Y-2 {Z-Y = 3 solution XYZ

The formula x = x, y = x + 2, z = x + 5 can't solve the concrete value, three unknowns need at least three agenda to solve the concrete x, y, Z

Given x + y + Z = 0, find the value of (x + y) (y + Z) (x + Z) + XYZ

X+Y+Z=0
X+Y=-Z
Y+Z=-X
X+Z=-Y
therefore
（X+Y)(Y+Z)(X+Z)+XYZ
=(-Z)*(-X)*(-Y)+XYZ
=-XYZ+XYZ
=0

As shown in the figure, in RT △ ABC, ∠ C = 90 °, AC + BC = 17, ab-bc = 8, find the values of cosa and tanb

Let AB = C, AC = a, BC = a
that
a+b=17
c-a=8
a²+b²=c²
Solution
a=5,b=12,c=13
therefore
cosA=b/c=12/13,tanB=b/a=12/5

In English, besides sorry, what other words or phrases are there?

There are many ways to say sorry:
1. If you are going to do something that may offend or disturb others, you should use exception me. For example, if you want to ask someone to give way, if you want to ask for directions, if you want to interrupt others' speech, and so on, you should use exception me to show politeness
2. If you have made a mistake, usually use sorry, or add the modal particle, I am very very sorry
I am sorry for being so late
It's all my fault, I apologize to you!
I regret that I didn't take your advice
I know these are the common expressions. There may be other ways for reference

What do you mean by UN, CCTV, NBA and UFO?

UN = United Nations
CCTV = CCTV
NBA = NBA
UFO = unidentified flying object

The cost is really getting out of hand

Out of hand!
The cost is really overdrawn

If the denominator is multiplied by 2 and the numerator is subtracted by 13, then the fractional value is equal to 1 / 10

Let the original fraction be x / y
Series of equations
x/(y+11)=1/2
(x-13)/(2y)=1/10
solve equations
x=18 y=25
The score was 18 / 25

All the forms of words with three orders, e.g. go to y and add ies

(1) add s directly, for example: run runs, draw draws, see sees. (2) add es after s, x, SH, CH, etc., for example: watch watches, watch watches, dress dresses. (3) after the words ending in Y: 1) the vowel letter is before y, and S is added directly, for example: buy businesses, enjoy jobs. (2) the consonant letter is before y, and Y becomes I

If x ＜ y, compare the following formulas and explain the reasons (1) 3x-1 and 3y-1 (2) - 2 / 3x + 6 and - 2 / 3Y + 6

(1) If XY > x, then - 2 / 3x ＞ - 2 / 3Y and - 2 / 3x + 6 ＞ - 2 / 3Y + 6
In conclusion, - 2 / 3x + 6 ＞ - 2 / 3Y + 6

English translation
1 wonders of the natural world 2 happen to sb.
3 happen to do sth.4 have a meeting
5 write a diary 6 some idea on
7 the ancient pyramids 7 get good grades
8 That's a fantastic idea.9 get out of
10 go through 11 become light
12 reply to sb.13 look over 14 fall away and down to

Natural wonders of the world
Take place in sb
Happen to do sth
There is a meeting
keep a diary
Some ideas,
Ancient pyramids
Get good grades
It's a wonderful idea
walk out
after
Become light
Answer sb
see
Disappear, down to