HOC24
Lớp học
Môn học
Chủ đề / Chương
Bài học
Hàm số y = 2 x + 5 5 có đạo hàm cấp 3 bằng :
A. y ' ' ' = 80 2 x + 5 3
B. y ' ' ' = 480 2 x + 5 2
C. y ' ' ' = - 480 2 x + 5 2
D. y ' ' ' = - 80 2 x + 5 3
He started investigating the case a week ago
A. He has started been investigating the case for a week.
B. He is investigating the case for a week.
C. He has been investigating the case for a week.
D. He has been investigating the case for a week ago.