①
9(x-3y)³+(3y-x)
=9(x-3y)³-(x-3y)
=(x-3y)[9(x-3y)²-1]
=(x-3y)(3x-9y-1)(3x-9y+1)
②
1/3a²-3b²
=1/3(a²-9b²)
=1/3(a-3b)(a+3b)
③
a^4-256b^4c^4
=(a²+16b²c²)(a²-16b²c²)
=(a²+16b²c²)(a-4bc)(a+4bc)
①
9(x-3y)³+(3y-x)
=9(x-3y)³-(x-3y)
=(x-3y)[9(x-3y)²-1]
=(x-3y)(3x-9y-1)(3x-9y+1)
②
1/3a²-3b²
=1/3(a²-9b²)
=1/3(a-3b)(a+3b)
③
a^4-256b^4c^4
=(a²+16b²c²)(a²-16b²c²)
=(a²+16b²c²)(a-4bc)(a+4bc)