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mai9abacninh
2 năm trước
1/ giải hệ p/trình : x-y =3 ta được nghiệm ( Xo,Yo ) .Khi đó biểu thức 2xo-yo bằng : 2x-3y=8 A.4 B.0 C.-5 D .-4 < nêu cách giải dùm em nha m.n >
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