Tính ( 3x^3 +15x^2 -81x) : (-3x)

To divide (3x^3 + 15x^2 - 81x) by (-3x), we can use long division.

First, let's set up the long division:

-x^2 - 5x + 27
-------------------
-3x | 3x^3 + 15x^2 - 81x

Now, let's start dividing:

-x^2 - 5x + 27
-------------------
-3x | 3x^3 + 15x^2 - 81x
- (3x^3 + 0x^2 + 0x)
-------------------
15x^2 - 81x
- (15x^2 + 0x)
----------------
-81x
- (-81x)
------------
0

The quotient is -x^2 - 5x + 27, and the remainder is 0.

Therefore, (3x^3 + 15x^2 - 81x) divided by (-3x) is equal to -x^2 - 5x + 27.