Question

Докажите тождество а) а³+b³+3ab(a+b)=(a+b)³
срочно

Answer 1

${a}^{3} + {b}^{3} + 3ab(a + b) = {a}^{3} + {b}^{3} +3 {a}^{2} b + 3a {b}^{2} = {(a + b)}^{3} \\ vspomni \: formulu \: \: \: {(a + b)}^{3} = {a}^{3} + 3 {a}^{2} b + 3a {b}^{2} + {b}^{3}$