Toán Lớp 8: 9 x mũ 4 . y mũ 3+3.x mũ 2 .y mũ 4 =
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Toán Lớp 8: 9 x mũ 4 . y mũ 3+3.x mũ 2 .y mũ 4 =
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$=3x^2y^3(3x^2+y)$