ПОМОГИТЕ РИШИТЬ:1)4 (2х-0,3у)-2 (3х-0,2у)=...2)-4,5-(6,55-3,5)=...3) -8 (2х+1)+5...

Question

ПОМОГИТЕ РИШИТЬ:1)4 (2х-0,3у)-2 (3х-0,2у)=...2)-4,5-(6,55-3,5)=...3) -8 (2х+1)+5 (3х-2)=...4)(х-2)-3 (х-1)=...

Answer 1

1)
4 (2х-0,3у)-2 (3х-0,2у) = 8х - 1,2у - 6х + 0,4у = 2х - 0,8у,
2)
-4,5-(6,55-3,5) = -4,5 - 6,55 + 3,5 = -1 - 6,55 = -7,55,
3)
-8 (2х+1)+5 (3х-2) = -16х - 8 + 15х - 10 = -х - 18,
4)
(х-2)-3 (х-1) = х - 2 - 3х + 3 = -2х + 1