求值域的过程
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求值域的过程
求值域的过程
求值域的过程
f(x)=(x²-x+1-1)/(x²-x+1)
=(x²-x+1)/(x²-x+1)-1/(x²-x+1)
=1-1/(x²-x+1)
x²-x+1=(x-1/2)²+3/4≥3/4
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