Question

вычислите:-1/3+(-1/3)в квадрате +(-1/3)в кубе

Answer 1

= ( - 1/3 ) • ( 1 + ( - 1/3 ) + ( - 1/3 )^2 ) = ( - 1/3 ) • ( 2/3 + 1/9 ) = ( - 1/3 ) • ( 6/9 + 1/9 ) = ( - 1/3 ) • 7/9 = - 7/27