Question

1°) calcule :
a)(1/2)^-¹
b)2-^5
c)(-2/5)^-²
d)3^-²

Answer 1

a) $( \frac{1}{2})^-^1=2^1 = 2$

b) $2^{-5}= (\frac{1}{2})^5= \frac{ 1^{5} }{2^5}= \frac{1}{32}$

c) $(- \frac{2}{5})^-^2=(- \frac{5}{2})^2= \frac{25}{4}$

d) $3^{-2} =( \frac{1}{3})^2 = \frac{1}{9}$