Вправи: 168

168. Обчисли.

а) (38)¹⁵ • (83)¹³ = (38)² •(38 • 83)¹³ = 964 •1 = 964;

б) 6¹² • (–16)¹⁴ = (61)¹² • (16)¹⁴ = (61 • 16)¹² • (16)² = 1 • 136 = 136;

в) (–59)¹³ • (–145)¹⁴ = (–59)¹³ • (–95)¹⁴ = (–59 • (–95))¹³ • (–95) = 1 • (–95) = –95 = –145;

г) (0,7)⁷ • 6³ • (–5)⁷ = (–0,2 • (–5))⁷ • 216 = 1 • 216 = 216;

ґ) 2,5⁹ • 0,7³ • 0,4⁹ = (2,5 • 0,4)⁹ • 0,343 = 1 • 0,343 = 0,343;

д) 0,25¹² • 5⁴ • 4¹² = (0,25 • 4)¹² • 5⁴ = 1 • 5⁴ = 1 • 625 = 625.