6.32 (16:43)2 + 20-7-

6 ∙ 3² - (16 ∶ 4 ∙ 3)² + 20 =

1) 16 ∶ 4 = 4

2) 4 ∙ 3 = 12

3) 3² = 9

4) 12² = 144

5) 6 ∙ 9 = 54

6) 54 - 144 = -90

7) -90 + 20 = -70

Ответ: -70