Номер 1265

Розкрий дужки:

1) 2(m + 1) = 2 • m + 2 • 1 = 2m + 2

2) 3(x – 4) = 3 • x – 3 • 4 = 3x – 12

3) –5(2х + 1) = –5 • 2х + (–5) • 1 = –10х – 5

4) (–1,6х + 2) • (–5) = –1,6х • (–5) + 2 • (–5) = 8х – 10

5) (–2х – у) • 3 = –2х • 3 – у • 3 = –6х – 3у

6) –7 • (х – 2) = –7 • х – 7 • (–2) = –7х + 14

7) (а – b) • (–3) = –3a – b • (–3) = –3a + 3b

8) (–4a + 5b) • 2 = –4a • 2 + 5b • 2 = –8a + 10b