约分【1】a^2+3ab/3b^2+ab 【2】n^2-9/3n-n^2
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![约分【1】a^2+3ab/3b^2+ab 【2】n^2-9/3n-n^2](/uploads/image/z/3963036-12-6.jpg?t=%E7%BA%A6%E5%88%86%E3%80%901%E3%80%91a%5E2%2B3ab%2F3b%5E2%2Bab+%E3%80%902%E3%80%91n%5E2-9%2F3n-n%5E2)
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约分【1】a^2+3ab/3b^2+ab 【2】n^2-9/3n-n^2
约分【1】a^2+3ab/3b^2+ab 【2】n^2-9/3n-n^2
约分【1】a^2+3ab/3b^2+ab 【2】n^2-9/3n-n^2
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