<span>1999-2000=-1
2-2002=-2000
-2-999=-1001
(-2000)-1000=3000
(-1)-998=-999
1001-(-999)=2000</span>
<span><em>7.2х+5.4=-3.6х-5.4</em>
<em>7,2х+3,6х=-5,4-5,4</em>
<em>10,8х=-10,8</em>
<em><u>х=-1</u></em></span>
Б) 6-3(х+1)=7-х
6-3х-3=7-х
-3х+х=7-6+3
-2х=4
х=-2
в) (8х+3)-(10х+6)=9
8х+3-10х-6=9
8х-10х=9-3+6
-2х=12
х=-6
11 22 33 44 55 66 77 88 99
НОД(11 22 33 44 55 66 77 88 99)= 11