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keodang.maiyeu
2 năm trước
Đẳng thức nào sau đây sai?A)(a+b)(c+d)-(a+d)(b+c)=(a-c)(d-b) với a;b;c;d thuộc Z B)ac+ad-bc-bd=(c+d)(a-b) với a;b;c;d thuộc Z C)a(b-c)-a(b+d)=a(c+d) với a;b;c;d thuộc Z D)a(b+c)-b(a-c)=(a+b)c với a;b;c; thuộc Z
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