<span>3√27=3<span>√3*3*3=3</span></span>
<u><span><span>3<span>√27=3</span></span></span></u>
<u><span><span><span>==============================================================================================================================================</span></span></span></u>
(4y-5)^2-(4y+5)^2=48y(1-10y)-10
(4y-5)^2-(4y+5)^2-48y(1-10y)+10=0
(4y-5)^2-(4y+5)^2+48y(10y-1)+10=0
(16y^2-40y+25)-(16y^2+40y+25)+(48y)(10y-1)+10=0
(16y^2-40y+25)-(16y^2+40y+25)+(480y^2-48y)+10=0
16y^2-40y+25-16y^2-40y-25+480y^2-48y+10=0
-128y+480y^2+10=0
480y^2-128y+10=0
240y^2-64y+5=0
D=b^2-4ac=(-64)^2-4*240*5=-704
Ответ: Нет решений
Х+у=12 и ху=35
х=12-у
(12-у)у=35
12у-у^2-35=0
y^2-12y+35=0
y^2-5y-7y+35=0
(y-7)(y-5)=0
y=7 y=5
х=5 х=7
Ответ: 5 и 7
4a + 5(a-3) + 8 - 2a = 4a + 5a - 15 + 8 - 2a = 7a - 7