y=-0.1x²+2.6x+43（0

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y=-0.1x²+2.6x+43（0y=-0.1x²+2.6x+43（0y=-0.1x²+2.6x+43（0解y=-0.1x²+2.6x+43=-0.1(x&#

y=-0.1x²+2.6x+43（0
y=-0.1x²+2.6x+43（0

y=-0.1x²+2.6x+43（0
解y=-0.1x²+2.6x+43
=-0.1(x²-26x)+43
=-0.1[x^2-26x+13^2-13^2]+43
=-0.1[(x-13)^2-169]+43
=-0.1(x-13)^2+16.9+43
=-0.1(x-13)^2+59.9.