Câu 1 (10 Điểm) - Q365381311
Cho hàm số y=ax3+bx2+cx+d (a≠0)," role="presentation" style="box-sizing: border-box; border-radius: 0px; display: inline; font-weight: normal; line-height: normal; font-size: 16px; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">y=ax3+bx2+cx+d (a≠0),y=ax3+bx2+cx+d (a≠0), có đồ thị (C)." role="presentation" style="box-sizing: border-box; border-radius: 0px; display: inline; font-weight: normal; line-height: normal; font-size: 16px; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">(C).(C). Tìm tập hợp tất cả các giá trị thực của tham số a" role="presentation" style="box-sizing: border-box; border-radius: 0px; display: inline; font-weight: normal; line-height: normal; font-size: 16px; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">aa để tiếp tuyến của (C)" role="presentation" style="box-sizing: border-box; border-radius: 0px; display: inline; font-weight: normal; line-height: normal; font-size: 16px; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">(C)(C) tại điểm x0=−b3a" role="presentation" style="box-sizing: border-box; border-radius: 0px; display: inline; font-weight: normal; line-height: normal; font-size: 16px; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">x0=−b3ax0=−b3a có hệ số góc nhỏ nhất.A. a<0." role="presentation" style="box-sizing: border-box; border-radius: 0px; display: inline; line-height: normal; font-size: 16px; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">a<0.a<0.B. a>0." role="presentation" style="box-sizing: border-box; border-radius: 0px; display: inline; line-height: normal; font-size: 16px; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">a>0.a>0.C. −1<a<0." role="presentation" style="box-sizing: border-box; border-radius: 0px; display: inline; line-height: normal; font-size: 16px; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">−1<a<0.−1<a<0.D.0<a<1. 0<a<1." role="presentation" style="box-sizing: border-box; border-radius: 0px; display: inline; line-height: normal; font-size: 16px; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; position: relative;">0<a<1.