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vu07112000
2 năm trước
duong thang y =ax-b cat truc oytai diem co tung do bang 3 va cat truc ox tai diem co hoanh do bang -2 khi do tong S =a+b bang A, S=-9phan2 B.S=3phan2 c.S=-3phan2 D. S=9phan2
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