Toán Lớp 8: Vbkalnamallalansz
8x^3 12x^2 +6xy^2+y^3
A.(x+y)^3
B. (2x+y) ^3
C.(2x+y^3)^3
D.(2x^3)y^3
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: Vbkalnamallalansz
8x^3 12x^2 +6xy^2+y^3
A.(x+y)^3
B. (2x+y) ^3
C.(2x+y^3)^3
D.(2x^3)y^3
Comments ( 2 )
$@dream$
$\text{Áp dụng hằng đẳng thức số 4}$
(A+B)^3 = A^3 + 3A^2 B + 3AB^2 + B^3
$\textit{Ta có:}$
8x^3+12x^2 +6xy^2+y^3
= (2x)^3 + 3.(2x)^2.y+3.2x.y^2+y^3
=(2x+y)^2
=> $\text{Chọn B.}$ (2x+y)^3
8x^3 + 12x^2 +6xy^2+y^3
= (2x)^3 + 3.(2x)^2.y + 3.2x.y^2 + y^3
= ( 2x + y)^3
=> Chọn $B$ – ( 2x + y)^3
-> Áp dụng hđt số 4: (A + B)^3 = A^3 + 3A^2B + 3AB^2 + B^3
_____________________
$#rosé$