X = 2Y - 7
3 * ( 2Y - 7 ) + 5Y = 12
6Y - 21 + 5Y = 12
11Y = 33
Y = 3
X = 6 - 7 = - 1
ОТВЕТ ( - 1 ; 3 )
=a^2+2ab+b^2+10a^2-2ab=b^2+10a^4=√3^2+10×2^4=√9+10×16=√9+160=3+160=163
С²-64=c²-8²=(c-8)*(c+8).
125c⁴+c=c*(125c³+1)=c*((5c)³+1³)=c*(c+1)*(c²-c+1).
(6y-1)(6y+1)-12y(3y-2)=3;
36у^2+6у-6у-1-36у^2+24у=3;
24у=3+1=4;
у=4:24;
у=4/24