Номер 1264

1) 3(a + 1) = 3 • a + 3 • 1 = 3a + 3 

2) 2(b – 3) = 2 • b – 2 • 3 = 2b – 6

3) –6(2a + 1) = –6 • 2a – 6 • 1 = –12a – 6

4) 5(–1,4x + 2) = 5 • (–1,4x) + 5 • 2 = –7x + 10

5) (–2,5x + 3) • 4 = –2,5 • 4 + 3 • 4 = –10x + 12

6) (а – 1) • (–1,5) = –1,5а – 1 • (–1,5) = –1,5а + 1,5

7) (–х + у) • (–1,3) = –х • (–1,3) + у • (–1,3) = 1,3х – 1,3у

8) (2a – 10b) • 7 = 2a • 7 – 10b • 7 = 14a – 70b