4х² - 1\144=0
(2х - 1\12) (2х + 1\12) = 0
2х - 1\12 = 0; 2х = 1\12; х = 1\24
2х + 1\12 = 0; 2х = -1\12; х=-1\24.
X^2-2x+1-x^2-4x-4=9y
y^2-6y+9-y^2-4y-4=5x
-6x-3=9y
-10y+5=5x
-2x-1=3y
-2у+1=х
-2(-2у+1)=3у
4у-2=3у
у=2
х=-3
2)
49+14u+u^2-25-10u-u^2=6v
4-4v+v^2-36+12v-v^2=4u
24+4u=6v
8v-32=4u
12+2u=3v
2v-8=u
12+2(2v-8)=3v
12+4v-16=3v
v=4
u=2*4-8=0
(208²-11²):219 =(43264-121):219=43143:219=197
**\%***\%****\%***-+*+*-*+\%-**
-0,8.(c+5)-0,7(10c+5)+0,8c²+10c-4=
=-0,8c-4-7c-3,5+0,8c²+10c-4=0,8c²+(10c-7c-0,8c)+(-4-3,5-4)=
=0,8c²+2,2c-11,5