Y`(x)=(3x²*(3-x²-3x)-x³*(-2x-3))/(3-x²-3x)²=(9x²-3x^4-9x³+2x^4+3x³)/(3-x²-3x)²=
(-x^4-6x³+9x²)/(3-x²-3x)²=x²(9-6x-x²)/(3-x²-3x)²=0
x²(9-6x-x²)=0
x=0
9-6x-x²=0
D=36+36=72 √D=6√2
x1=(6-6√2)/-2=3√2-3
x2=(6+6√2)/-2=-3√2-3
6х-8у
Если х=1|2,у=1/4,то 6х-8у=6*1/2-8*1/4=3-2=1
(5x+4)(25x²-20x+16)-64=(5x)³+4³-64=125x³+64-64=125x³