y`=20-2.5x^1.5
y`=0
2.5x^1.5=20
x^1.5=8
x^3=8^2
x=64^(1/3)=4
y(4)=80-4^2.5-25=80-32-25=23
y(1)=20-1-25=-6
y(9)=180-243-25=-88
минимально у(9)=-88
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y`=20-2.5x^1.5
y`=0
2.5x^1.5=20
x^1.5=8
x^3=8^2
x=64^(1/3)=4
y(4)=80-4^2.5-25=80-32-25=23
y(1)=20-1-25=-6
y(9)=180-243-25=-88
минимально у(9)=-88