Question

Помогите пожалуйста даю 80 баллов

Answer 1

2х-3-2х"-х+81=х+2х"+78
14ав-9а"-3в"-3а"-5ав+4в"=9ав-12а"+в"
2а"'-6в"'-2а"'+6ав+5а"'+3ав-7в"'=(2а"'-2а"'+5а"')+(-6в"'+7в"')+(6ав+3ав)=5а"'+в"'+9ав



12-(3х"+5х)+(-8х+3х")=0
12-3х-5х-8+3х=0х-3

Answer 2

1)=2х-3+2х^2-х+81=х+2х^2+78
2)=14аб-9а^2-3б^2+3а^2-5аб+4б^2=9аб-6а^2+б^2
3)=2а^3-6б^3-(2а^3-6аб-5а^3+3аб+ +7б^3)=2а^3-6б^3-2а^3+6аб+5а^3-3аб-7б^3=5а^3-13б^3+3аб

2.
=7/12х^2+2/9ху-1/2х^2+1/3ху- 1/12х^2-5/9ху=
=(7/12х^2-6/12х^2-1/12х^2)+ (2/9ху+3/9ху-5/9ху)=0

3.
12-3х^2-5х-8х+3х^2=0
12-13х=0
13х=12
х=12/13