<span>х^2=(х-6)^2+(х-3)^2</span>
x²=x²-12x+36+x²-6x+9
<span>x</span>²-18x+45=0
<span>D=324-4*45=144=12</span>²
<span>x1=(18+12)/2=15
x2=(18-12)/2=3
</span>
1) - (6,3 - y) - (9,1 + y) = - 6,3 + y - 9,1 - y = - 15,4
2) (a - b + 6,1) - (- a - b + 6,1) = a - b + 6,1 + a + b - 6,1 = 2a
3) - (7,2 - m + k) + (5,3 + k) = - 7,2 + m - k + 5,3 + k = m - 1,9
3х-у=15<span>
х+6 - у
----------=6
2 3
y=3x-15
(x+6)/2-(3x-15)/3=6
(x+6)/2-x+5=6
x+6=2+2x
x=4
y=-3</span>
(а-9)^2-(81+2а)=а^2-18а+81-81-2а=а^2-20а