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Ligu2020
2 năm trước
Rút gọn: a) (a^2+b^2-c^2)-(a^2-b^2+c^2)^2 b) (a+b+c)^2+(a+b-c)^2-2.(a+b)^2 c) (a+b+c)^2+(a-b+c)^2+(a+b-c)^2+(b+c-a)^2
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