当a=-3b=2时.求分式3a^2-ab/9a^2-6ab+b^2的值

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当a=-3b=2时.求分式3a^2-ab/9a^2-6ab+b^2的值当a=-3b=2时.求分式3a^2-ab/9a^2-6ab+b^2的值当a=-3b=2时.求分式3a^2-ab/9a^2-6ab+

当a=-3b=2时.求分式3a^2-ab/9a^2-6ab+b^2的值
当a=-3b=2时.求分式3a^2-ab/9a^2-6ab+b^2的值

当a=-3b=2时.求分式3a^2-ab/9a^2-6ab+b^2的值
3a^2-ab/9a^2-6ab+b^2
a(3a-b)/(3a-b)^2
=a/(3a-b)
=-3/(-9-2)
=3/11