no 1,2,3,4,dan 5 mohon bantuan.ya bro

1)
5³ x 2⁻² x 1⁶
  5 x 2 x 1
= 5³ x 5⁻¹ x 2⁻² x 2⁻² x 1⁶ x 1⁻¹
= 5² x 2⁻⁴ x 1⁵
= 25 x 1/16 x 1
= 1.5625

2)
2√20 + √28 - 3√25 + 4√63 - 5√80
= 2√4x5 + √4x7 - 3x5 + 4√9x7 - 5√16x5
= 4√5 + 2√7 - 15 + 12√7 - 20√5
= 14√7 - 16√5 - 15

3)
√(49 - 20√6)
= √(49 - √20x20x6)
= √(49 - 2√600)
= √{(25x24) - 2√25x24}
= √25 - √24
= 5 - √24

4)
²log 64 + 2 ²log √2 - 3 ²log 1/32
= 6 + 1 - ²log 2⁻¹⁵
= 6 + 1 - (-15)
= 22

5)
log 36 = log (3² x 2²)
= log 3² + log 2²
= 2 log 3 + 2 log 2
= 2b + 2a = 2(a + b)

Maaf kalau salah ^^