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huyenthoaibb
2 năm trước
1Cho hệ phương trình 2x+y=3m+1 và 3x+2y=2m-3 Giải hệ phương trình khi m = – 1 2 Cho hệ phương trình : -2mx+y=5 và mx+3y=1 Giải hệ (1) khi m = 1.
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