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nhatle180497
2 năm trước
Bài 1 : Thực hiện phép tính : 99/100 : (1/4 - 1/12 + 1/3) - (-7/5)^2 Bài 2 : Tìm x , y biết a) |x + 1/3|: 3 1/3 - 1 1/5 (hỗn số ) = -3 b) x^2 - 2/3 x = 0 c) (x - 2)(x^2 - 9) = 0 d) 3 ( x - 1/2 ) - 5 (x + 3/10) = 1/2 e) 1/21 + 1/28 + 1/36 + .... + 2/y(y+1) = 2/9
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