¿Matematica help me please urgente?

1. 2⁻³

a. 1/8

b. -1/8

c. 8

d. -8

2. (6x³/2x⁸)³

a. -27x¹⁵

b. 18x⁶/-6x²⁴

c. -27/x¹⁵

d. -3/x¹⁸

3. 6x⁷y⁴z/4x²y³z⁴

a. 4yz³/2x⁵

b. 3y/2x⁵z³

c. 3x⁹y⁷/2z⁵

d. 3x⁵y/2z³

4. 8ˉ¹+2ˉ¹=10ˉ¹

a. cierto

b. falso

5. (-2x⁸)ˉ³

a. 1/ˉ8x²⁴

b. ˉ8/x²⁴

c. ˉ6/x¹¹

d. 1/ˉ6x¹¹

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