(2a-11)(11+2a)-(2a-5)² = 0
4а² - 121 - 4а² + 20а - 25 =0
20а - 146 = 0
20а = 146
а = 146/20
а = 7,3
-4y(y+2)+(y-5)^2 =-4y^2-8y+y^2-10y+25=-3y^2-18y+25
________________
2(a-3)^2-2a^2=2(a^2-6a+9)-2a^2=2a^2-12a+18-2a^2=-12a+18
14/25+3/2=28/50+75/50=103/50=
=2 3/50
(6,8-4,7)/1,4 = 2,1/1,4 = 1,5.
<span>3(7x-5)-<span>(17x+4)=17</span></span>