№ 23 Алгебра = № 23 Математика
Знайдіть значення виразу:
1) (–2)4;
2) (–5)3;
3) 0,2 ⋅ 53;
4) (1,5 – 1,8)2.
Розв'язок:
1) (–2)4 = 24 = 2 ⋅ 2 ⋅ 2 ⋅ 2 = 16;
2) (–5)3 = –53 = –(5 ⋅ 5 ⋅ 5) = –125;
3) 0,2 ⋅ 53 = 5–1 ⋅ 53 = 52 = 25;
4) (1,5 – 1,8)2 = (–0,3)2 = $\left(-\frac{3}{10}\right)^2=\frac{9}{100}=$0,09.