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mai1401
2 năm trước
rút gọn các biểu thức sau 1 cách nhanh nhất a) (6x - 2)^2 + (2 - 5x)^2 + 2(6x - 2) (2 - 5x) b) (2a^2 + 2a + 1) (2a^2 - 2a + 1) - (2a^2 + 1)^2 c) (x + 3) (x^2 - 3x + 9) - (54 + x^3) d) (2x + y) (4x^2 - 2xy + y^2) - (2x - y) (4x^2 + 2xy + y^2) e) (a + b)^2 - (a - b)^2 f) (a + b)^3 - (a - b)^3 - 2b^3
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