tolong diisu ya plissss

1) (64x^5b²) ÷ (8x⁴b) = 8xb

2) 2x^5yz⁴ ÷ 3xy⁴z = 2x⁴z³ / 3y³

3) (4a³b - 20ab² + 8a²b) ÷ 4ab
= 4ab (4a² - 5b + 2a)
-----------------------------
4ab
= 4a² - 5b + 2a

4) 2x² - x - 10
---------------------
x + 2

= (2x - 5)(x + 2)
------------------------
(x + 2)

= 2x - 5