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Toán Lớp 9: `a)`$(x+y)^{2}$ + $(x-y)^{2}$ `b)` $(x+y)^{3}$ `-` `6xy“(x+2y)` Rút gọn

Home/ Toán Lớp 9: `a)`$(x+y)^{2}$ + $(x-y)^{2}$ `b)` $(x+y)^{3}$ `-` `6xy“(x+2y)` Rút gọn

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