y=-5(x^2-8x)=-5(x^2-8x+16-16)=-5(x-4)^2+80최대값은x=4일때이므로y=80/y=-3(x^2-6x)+15=-3(x^2-6x+9-9)+15=-3(x-3)^+42최대값은x=3일때이므로y=42
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