(-2/3+(-2/15))+(-1,85+(-1.35))= ? Помогите

( - 2 / 3 + ( - 2 / 15 ) ) + ( - 1 , 85 + ( - 1 . 35 ) ) = ( - 2 / 3 - 2 / 15 ) + ( - 1 , 85 + ( - 1 . 35 ) ) = ( - 2 / 3 - 2 / 15 ) + ( - 1 , 85 - 1 . 35 ) = - ( 2 / 3 + 2 / 15 ) + ( - 1 , 85 - 1 . 35 ) = - ( 2 / 3 + 2 / 15 ) - ( 1 , 85 + 1 . 35 ) = - ( 15 / 3 * 2 + 15 / 15 * 2 ) / 15 - ( 1 , 85 + 1 . 35 ) = - ( 5 * 2 + 1 * 2 ) / 15 - ( 1 , 85 + 1 . 35 ) = - ( 10 + 2 ) / 15 - ( 1 , 85 + 1 . 35 ) = - 12 / 15 - ( 1 , 85 + 1 . 35 ) = - 4 / 5 - ( 1 , 85 + 1 . 35 ) = - 4 / 5 - 3 , 2 = - 4 / 5 - 3 целых 1 / 5 = - 3 целых 5 / 5 = - 4 ответ: - 4