(1/2a)в7 *(1/2а)= (-2,5)в3 *(-2,5а)в8= (-9/7)в8:(-9/7)в5= (3y/4)в4:(3y/4)в5= (2а)в5::(2а)в3= 7ав(2а+3в)= (7х-9)+(2х-8)=1 (0,2х-7)-(6-0,1х)=2

Упростим:

1) (1/2 * a)^7  * (1/2 * а) =  (1/2)^7 * a^7 * * a = (1/2)^8 * a^8 = 1/256 * a^8;

2) (-2,5)^3 * (-2,5 * а)^8 =  -2.5^3 * 2.5^8 * a^8 = -2.5^11 * a^8;

3) (-9/7)^8/(-9/7)^5 =  (-9/7)^3 = -(9/7)^3;

4) (3 * y/4)^4/(3 * y/4)^5 = (3 * y/4)^(-1) = 4/(3 * y);

5)  (2 * а)^5/(2 * а)^3 = 2^5 * a^5/(2^3 * a^3) = 2^2 * a^2 = 4 * a^2;

6)  7 * а * b * (2 * а + 3 * b) = 14 * a^2  * b + 21 * a * b^2;

7) Найдем корень.

(7 * х - 9) + (2 * х - 8) = 1;

7 * x 9 + 2 * x 8 = 1;

9 * x 17 = 1;

9 * x = 1 + 17;

9 * x = 18;

x = 18/9;

x = 2.

8)  Найдем корень.

(0,2 * х - 7) - (6 - 0,1 * х) = 2;

0.2 * x 7 6 + 0.1 * x = 2;

0.3 * x 13 = 2;

0.3 * x = 15;

3 * x = 150;

x = 150/3;

x = 50.