y=log1/2底(-x^2+2x+3)求值遇
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y=log1/2底(-x^2+2x+3)求值遇y=log1/2底(-x^2+2x+3)求值遇y=log1/2底(-x^2+2x+3)求值遇y=log1/2底(-x^2+2x+3)=log1/2(-(x
y=log1/2底(-x^2+2x+3)求值遇
y=log1/2底(-x^2+2x+3)求值遇
y=log1/2底(-x^2+2x+3)求值遇
y=log1/2底(-x^2+2x+3)=log1/2(-(x-1)^2+4)>=log1/24=-2