(7,1/3 + 60, 2/3) : (12, 1/3 + 4, 3 / 7) = 68 : 12, 16/21
X2+7x+12=0
D=7^2-4×1×12=49-48=1
x1=-7+1/2×1=-6/2=-3
x2=-7-1/2×1=-8/2=-4
A²-16a+65=a²-2*8*a+8²+1=(a-8)²+1
поскольку (a-8)² ≥0 при любых а , то (a-8)²+1 >0 при любых а
1) 1 *3/ 6*3 = 3/18
1 *2/ 9*2 = 2/18
2) 1*b/ab = b/ab
a/ab
3) 1 * y/ x^2y^2 = y/ x^2y^2
x/x^2y^2