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nguyenthuydung.712001
2 năm trước
mọi người giúp mình với ! 5 sao ạ! - Cho hệ phương trình: nx-y=4 x+y=1 Với giá trị nào thì hệ phương trình có duy nhất một nghiệm? Với giá trị nào thì hệ phương trình vô nghiệm?
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