Упростите выражение: 7,2х+1,8х; 1\6х+1/2х; 9,3х-1,4х; 3/4х-1/2х; 10х-6,7х; х-4/5х

Question

Упростите выражение:
7,2х+1,8х; 1\6х+1/2х; 9,3х-1,4х; 3/4х-1/2х; 10х-6,7х; х-4/5х

Answer 1

7,2х+1,8х=x(7,2+1,8)=9х

1/6х+1/2х=х(1/6+1/2)=х(1/6+3/6)=4/6х=2/3х

9,3х-1,4х=х(9,3-1,4)=7,9х

3/4х-1/2х=х(3/4-1/2)=х(3/4-2/4)=1/4х

10х-6,7х=х(10-6,7)=3,3х

х-4/5х=х(1-4/5)=1/5х