Write down the Chinese meanings of the following abbreviations

Write down the Chinese meanings of the following abbreviations

Order: World Trade Organization, BBC, ABC, United States of America, people's Republic of China, morning, afternoon

ABC,BBC,

ABC: American radio
BBC: British Broadcasting Station
PRC: PRC = Postal Rate Commission
People's Republic of China

How to decompose 89 into (X-Y) (x + y) form?

Is XY a positive integer? If so, then
(x+y)(x-y)=89
Because 89 is a prime, it can only be decomposed into 89 * 1
And X + Y > X-Y
So x + y = 89, X-Y = 1
x=45,y=44
So x * y = 1980

If x ^ 2-10x + y ^ 2-16y + 89 = 0, then x=__ ,y=__
Sense of time
X ^ 2 is the square of X

(x^-10x+25)+(y^-16y+64)=0
(x-5)^+(y-8)^=0
So: x = 5, y = 8

When y = (x ^ 90) * (y ^ 6) * (Z ^ 3) * (1-x-y-z) is the maximum value, what is the value of X, y, Z?

Original formula = 90 ^ 90 * (x / 90) ^ 90 * 6 ^ 6 (Y / 6) ^ 6 * 3 ^ 3 (Z / 3) ^ 3 * (1-x-y-z)
=90^90*6^6*3^3*(x/90)(x/90)...(x/90)(y/6)...(y/6)(z/3)(z/3)(z/3)(1-x-y-z)

X-100=(Y+Z)×2／13 y-100=(x+z)×9／16 z-90=(x+y)×1／3

Sorting out
13x-2y-2z=1300 (1)
9x-16y+9z=-1600 (2)
x+y-3z=-270 (3)
(1)+(3)×2
15x-8z=760 (4)
(2)+(3)×16
25x--39z=-5920 (5)
(4)×5-(5)×3
77z=21560
z=280
x=(39z-5920)/25=200
y=(x+z)×9/16+100=370

If x = 1, y = 2, z = 3, then

The expression (x > y? X: y) = = -- the value of Z is 0, where 0 means false (x > y? X: y) means the comparison between X and y, when x > y, take x, otherwise take y, so (x > y? X: y) = 2 and - Z comparison, z = 3,

[x-9]/[89-x]=4
.huocheng

x=73

（X-9）/（89-4）=4

349

How to solve (X-9) / (89-x) = 4
OK, we can add the last hour

(x-9)/(89-x)=4
x-9=4(89-x)
x-9=356-4x
4x+x=356+9
5x=365
x=73