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vietphu25852
2 năm trước
Thu gọn đa thức sau rồi tìm bậc của chúng: a) 3y(x^2-xy)-7x^2(y+xy) b) 4x^3yz-4xy^2z^2-(xyz+x^2y^2z^2)(a+1), với a là hằng số
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