tolong jwb dengan benar plissssss

1) (70a² / b) ÷ (7a / 2b)
= 70a² × 2b
-------------------
b × 7a

= 10a × 2
= 20a

2) (5a / 2a) + (5b / b)
= (5a . b) + (2a . 5b)
-----------------------------
(2a . b)

= 5ab + 10ab
---------------------
2ab

= 15ab
-----------
2ab
= 15/2

3) (2a²b / a ) - (ab² / 2b)
= (2a²b . 2b) - (a . ab²)
----------------------------------
(a . 2b)

= 4a²b² - a²b²
--------------------
2ab

= 3a²b²
------------
2ab

= 3ab / 2

4) (10a⁴ / 3a²) × (12a / 5)
= 10a⁴ . 12a
------------------
3a² . 5

= 2a⁴ . 4
---------------
a

= 8a³

5) (2a / b) × (b² / a²) + (2 / ab)
= (2b / a) + (2 / ab)
= (2b . ab) + (a . 2)
---------------------------
( a . ab)

= 2ab² + 2a
-------------------
a²b

= a (2b² + 2)
-------------------
a (ab)

= 2b² + 2
---------------
ab

1. (70a^2/b)/(7a/2b)
= 70a^2. 2b/ b. 2a
= 10a.2 = 20a

maaf kalo itu aja
semoga membantu