tolong bantu kk,ini buat mtk kls 3 smp,jawabannya udh benar tapi mengerjakan ya bagaimana???? jawab nya bagi yg pandai mtk

2.
-1/64 = -1/(4³) = -4^-3

3.
2^-3 x 2^-4 = 2^(-3-4) = 2^-7 = 1/2^7 = 1/128

4.
125^⅔ - 16^¾
= (5³)^⅔ - (2⁴)^¾
= 5^(3x⅔) - 2^(4x¾)
= 5² - 2³
= 25 - 8 = 17

5.
(4a)^-3 = 1/(4a)³ = 1/(4³a³) = 1/(64a³)

6.
32^1/5 x (½)^-2
= (2^5)^1/5 x 2²
= 2^(5 x 1/5) x 4
= 2 x 4 = 8

7.
3^1½
= 3^3/2
= (3³)^½
= 27^½
= √27

8.
³√64 = ³√(4³) = (4³)^⅓
= 4^(3x⅓)
= 4¹
= 4

9.
(81^½)^3/2
= 81^(½ x 3/2)
= (3⁴)^¾
= 3^(4 x ¾)
= 3³
= 27

10.
√8 + √18 - √162
= √4x2 + √9x2 - √81x2
= 2√2 + 3√2 - 9√2
= (5-9)√2
= -4√2