Toán Lớp 8: 1)Rút gọn biểu thức:
(a+b)$x^{3}$ -(a-b)$x^{3}$ -2b$x^{2}$
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Toán Lớp 8: 1)Rút gọn biểu thức:
(a+b)$x^{3}$ -(a-b)$x^{3}$ -2b$x^{2}$
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