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nguyenthuyai752
2 năm trước
1. Cho hàm số y = [x^2 - 3mx +2m-1] / [x-3] (m là tham số). Nếu phương trình y'= 0 có hai nghiệm phân biệt thì a. m <8/7 b. m >7/8 c. m >8/7 d. m <7/8 2. Điện lượng truyền trong dây dẫn có phương trình Q=3t^2 +2t-1. Tính cường độ dòng điện tức thời tại thời điểm t0= 3 (giây) ?
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