an=2a(n-1) (n 2)/【n(n 1)】(n≥2,n∈n*)对比a^2c c^2a ab(a-2b) bc(c-2b)对比f(x)=log9(x 8-α/x)在[1,正∞)AB=AC=3COS=1/9
跪求f(x)=ax2 bx c(a≠0)a3 2a2b ab2-2a2b-ab2 b3跪求f(x)=ax2 bx c(a
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