Toán Lớp 8: Bài 15: Chọn câu sai.
A. (-b – a)3 = -a3 – 3ab(a + b) – b3
B. (c – d)3 = c3 – d3 + 3cd(d – c)
C. (y – 2)3 = y3 – 8 – 6y(y + 2)
D. (y – 1)3 = y3 – 1- 3y(y – 1)
Leave a reply
Register Now
Login
Lost Password
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Toán Lớp 8: Bài 15: Chọn câu sai.
A. (-b – a)3 = -a3 – 3ab(a + b) – b3
B. (c – d)3 = c3 – d3 + 3cd(d – c)
C. (y – 2)3 = y3 – 8 – 6y(y + 2)
D. (y – 1)3 = y3 – 1- 3y(y – 1)
Comments ( 2 )
Gửi bn:
Bài 15:
A. (-b – a)³ = -a³ – 3ab(a + b) – b³ ⇒ Đúng
B. (c – d)³ = c³ – d³ + 3cd(d – c) ⇒ Đúng
C. (y – 2)³ = y³ – 8 – 6y(y + 2) ⇒ Sai
D. (y – 1)³ = y³ – 1- 3y(y – 1) ⇒ Đúng