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VyNguyen
2 năm trước
cho a,b thuộc Z , b khác 0 . khẳng định nào đúng ? a) a/b= a.c/b.c b) b/a= b.m/a.m ( m thuộc Z , m khác 0 ) c) a/b = a.n/b.n( n thuộc N) d) a/b= a.c/b.c ( c thuộc Z , c khác 0)
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