Вправи: 20.19

20.19 Обчисліть:

1) ((5^–2)^–6 • (5^–8)²)^–1 = (5¹² • 5^–16)^–1 = (5^–4)^–1 = 5⁴ = 625;

2) 10-8 • (10-2)4(10-5)3 = 10-8 • 10-810-15 = 10-1610-15 = 10^–1 = 110;

3) (-3-2)3•(3-1)5(36)-2 = 3-6 • 3-53-12 = 3-113-12 = 3¹ = 3;

4) (7-2)-5 •(74)-3(73)-4 •(7-1)-8 = 710 • 7-127-12 • 78 = 7² = 49.