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数学题当x
人气:335 ℃ 时间:2020-06-13 19:57:13
解答
f(x)=(x²-3x+1)/(x+1)
=(x²+x-4x-4+5)/(x+1)
=[x(x+1)-4(x+1)+5]/(x+1)
=x-4+5/(x+1)
=x+1+5/(x+1)-5
x
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