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Vinhdang509
2 năm trước
1) Phân số không bằng phân số -2 phần 9 là a) -6 phần 7 b) -4 phần 19 c) -10 phần 45 d) 2 phần -9 2) nếu a.b bằng 0 thì a) a=0 b) b=0 c) a=0và b=0 d) a=0 hoặc b=0
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