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2009-11-28T17:39:32+01:00
(7⁹:49⁻⁵)² × 7⁻⁴⁰=
=(7⁹:(7²)⁻⁵)² × 7⁻⁴⁰=
=(7⁹:7⁻¹⁰)² × 7⁻⁴⁰=
=(7⁹⁺¹⁰)² × 7⁻⁴⁰=
=(7¹⁹)² × 7⁻⁴⁰=
=7³⁸ × 7⁻⁴⁰=7⁻²
2009-11-28T17:41:50+01:00
(7⁹:7⁻¹⁰)² × 7⁻⁴⁰ = (7¹⁹)² × 7⁻⁴⁰ = 7³⁸ × 7⁻⁴⁰ = 7⁻²
2009-11-28T17:42:50+01:00
(7⁹:49⁻⁵)² × 7⁻⁴⁰=7(⁹₋(₋¹⁰))⁺²⁻⁴⁰=7₋² 7 do -2