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taducmanh
2 năm trước
RÚT GỌN BIỂU THỨC a) A= (x-y) (x^2 + xy + y^2) - (x+y) (x^2 - xy +y^2) b) B= (a^2b^2 -5a) (a^4b^4 + 5a^3b^2 + 25d^2) c) C= (2x + 3y) (4x^2 - 6xy + 9y^2) d) D= (y + 2) (y^2 - 2y + 4)
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