вычислите квадрат и куб числа: а) 1/2 ; б) 2/5 ;

Вычислим квадрат и куб чисел: 

а) 1/2; 

(1/2)^2 = 1^2/2^2 = 1/4;

(1/2)^3 = 1/8;

б) 2/5; 

(2/5)^2 = 2^2/5^2 = 4/25;

(2/5)^3 = 4/25 * 2/5 = 8/125;

в) 1/3; 

(1/3)^2 = 1/9;

(1/3)^3 = 1/27;

г) 5/2; 

(5/2)^2 = 25/4;

(5/2)^3 = 125/8;

д) 1 1/2 = 1 + 1/2 + 3/2; 

(3/2)^2 = 9/4;

(3/2)^3 = 27/8;

е) 3 1/3 = 10/3; 

(10/3)^2 = 10^2/3^2 = 100/9; 

(10/3)^3 = 10^3/3^3 = 1000/27.