0.01x^2+0.32xy+2.56y^2
(0.1x)²+2*0.1x*1.6y+(1.6y)² = 0.01x² + 0.32xy + 2.56y²
1) 0,6a+1,3=1,7+0,3a
0,6a-0,3a = 1,7-1,3
0,3a=0,4
a=4/3
2) 8-7x=5x+2
-7x-5x=2-8
-12x=-6
x=1/2; 0,5
1)