Tolong bantu jawabin dong,Makasih

4) 2-³ ÷ 2^-7

= 2-³
--------
2^-7

= 2^7
-----------
2³

= 2⁴

= 16 ( C )


5) √80 - √20 + √45
= √(16 × 5 ) - √(4 × 5 ) + √(5 × 9 )
= 4√5 - 2√5 + 3√5
= 5√5 ( B )

6) √90 ÷ √5
= 3√10
------------
√5

= ( 3√10)(√5 )
---------------------
( √5)( √5 )

= 3√50
------------
5

= 15√2
-----------
5

= 3√2 ( B )

Caranya lihat di foto ya.