1 4. Calcule: a) 20⁵•20⁷=
b) (-7) ¹⁰• (-7)⁵ =
c) (-2)-²• (-2)⁸ --
d) 5-³•5¹².5-⁵ =
e) 9²⁰ ÷ 9¹² =
f) (-5)-⁵ ÷ (-5)³=
g) 4⁷ ÷ 4-²=
h) 7⁹ ÷ 7⁵.7³ =
i) 3-².3⁵ ÷ 3-⁴ =​
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