Question

calcule o valor numerico da expressao

a² - b² para a = 1/3 e b = 2/5

Answer 1

a² - b² -----------a = 1/3  e  b = 2/5

(1/3)² - (2/5)² = 
1/9 - 4/25 = ----mmc(9,25) = 225
25/225 - 36/225 = - 11/225