Ile to wyjdzie : (7^{9}:49^{-5})^{2}*7^{-40}=
EDIT: (I'm sorry)
Ile to wyjdzie :
(7^{9}:49^{-5})^{2}*7^{-40}=
= [7⁹ :(7²)⁻⁵]² * 7⁻⁴⁰ =
= [7⁹:7⁻¹⁰]²* 7⁻⁴⁰ =
= (7¹⁹)² *7⁻⁴⁰ =
= 7³⁸*7⁻⁴⁰ =
= 7⁻² =
= (1/7)²=
=1/49
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EDIT: (I'm sorry)
Ile to wyjdzie :
(7^{9}:49^{-5})^{2}*7^{-40}=
= [7⁹ :(7²)⁻⁵]² * 7⁻⁴⁰ =
= [7⁹:7⁻¹⁰]²* 7⁻⁴⁰ =
= (7¹⁹)² *7⁻⁴⁰ =
= 7³⁸*7⁻⁴⁰ =
= 7⁻² =
= (1/7)²=
=1/49