If the N + 3 power of 3 = a, use a lion with a to represent the n power of 3

∵ 3 to the power of N + 3 = 3 to the power of n × 3 & sup3; = a
The nth power of 3 = A / (3 & sup3;) = A / 27

Given that the nth power of (8 to the 2nd power) is a, the algebra of a is used to express the value of the 12nth power of 2

(8²)^n=a
That is: [(2 & # 179;) &# 178;] ^ n = a
(2^6)^n=a
2^6n=a
Then: 2 ^ 12n = (2 ^ 6N) &# 178; = A & # 178;

The original number of female workers in a workshop accounted for 14% of the total number of workers in the workshop, and then the number of male and female workers increased by 4 respectively. At this time, the number of female workers accounted for 13% of the total number of workers in the workshop. How many were the original workers in the workshop?

Factorization 36a & sup2; - (A & sup2; + 9) & sup2;

36a²—(a²+9)²
=(6a-a²-9)(6a+a²+9)
=-(a²-6a+9)(a²+6a+9)
=-(a-3)²(a+3)²

In the chorus, men account for 5 / 6 of the women, and then three more women. Men account for 5 / 12 of the total number. How many boys and girls are there?

Set X for girls and 5x / 6 for boys,
After increasing the number of girls, the number of girls is x + 3, the number of boys is still 5x / 6, and the total number is x + 3 + 5x / 6
5 / 12 × (x + 3 + 5x / 6) = 5x / 6
X = 18
Therefore, there are 21 girls and 15 boys

First simplify, then evaluate: 9y + 6y2-3 (Y-2 / 3y2), where y = - 2

9y+6y2-3（y-2/3y2）
=9y+6y²-3y+2y²
=6y+8y²
=6*（-2）+8*（-2）²
=-12+32
=20

There are 54 students in class 62. One fourth of the girls are equal to one fifth of the boys. How many boys are there in class 62?

One quarter of girls are equal to one fifth of boys,
So girls: boys = (1 / 5): (1 / 4) = 4:5
Boys: 54 * 5 / (4 + 5) = 30

It is known that the polynomial P = 3x ^ 2-6x + 7, q = ax ^ 2 + BX + C, P + Q is a quadratic trinomial, right? If so, please explain the reason; if not, please explain what kind of algebraic formula P + Q is, and point out the conditions a, B, C satisfy
P+Q=(3x^2-6x+7)+(ax^2+bx+c)
=(3+a)x^2+(b-6)x+(7+c)
(1) When a_____ P + Q is a quadratic form
(2) When a_ ,b___ When p + Q is one, once is
(3) When a_ ,b___ P + Q is a constant
(4) When a_ ,b_ ,c_____ P + Q is a quadratic trinomial
I don't have any, sorry
black

(1) When a ≠ - 3
(2) When a = - 3, B ≠ 6
(3) When a = - 3, B = 6
(4) When a ≠ - 3, B ≠ 6, C ≠ - 7

Number a is 20% less than number B, number B is 25% more than number C, and what percentage is number a

Let B be X
The number of a is 0.8x, and the number of C is x / 1.25
The ratio of a to C is 0.8x / (x / 1.25) = 2
The number a is 200% of the number C

If - (A-2) is negative, then A-2_ (fill in = < >) 0, if - [- (a + b)] is negative, then a + B_ (fill in = < >) 0

-If (A-2) is negative, then A-2_ ＞__ (fill in = < >) 0
If - [- (a + b)] is negative, then a + B_ ＜__ (fill in = < >) 0

If the N + 3 power of 3 = a, use a lion with a to represent the n power of 3