约分:(1)a^2b+3ab/3b^2+ab(2)n^2-9/3n-n^2(3)x^2-3xy/x^2-6xy+9y^2

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约分:(1)a^2b+3ab/3b^2+ab(2)n^2-9/3n-n^2(3)x^2-3xy/x^2-6xy+9y^2
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约分:(1)a^2b+3ab/3b^2+ab(2)n^2-9/3n-n^2(3)x^2-3xy/x^2-6xy+9y^2
约分:(1)a^2b+3ab/3b^2+ab(2)n^2-9/3n-n^2(3)x^2-3xy/x^2-6xy+9y^2

约分:(1)a^2b+3ab/3b^2+ab(2)n^2-9/3n-n^2(3)x^2-3xy/x^2-6xy+9y^2