4x^2 + 8x
= 4x . x + 4x . 2
= 4x ( x + 2 )
Chọn A
3/5 + 3/10 x 5/3
= 3/5 + 1/2
= 11/10
Góc tới = 180°
D
Y = a^3 - b^3
Y = ( a - b ) ( a^2 + a . b + b^2 )
K = a^2 - b^2
K = ( a + b ) ( a - b )
Ới