Ответ:−3 · (4 − 7) = −3 · (−3) = 9.2(5 − 3) + 1 = 2 · 2 + 1 = 5.−(6 + 2) + 9 = −8 + 9 = 1.3² − 5 = 9 − 5 = 4.