Respuesta:
B ) ( ab ) ⁻¹ = 1/3
Explicación paso a paso:
Recordemos que x⁻¹ = 1/x
{ ( a⁻¹ )⁻¹ + b⁻¹ }⁻¹ = b/4
{ a¹ + b⁻¹ }⁻¹ = b/4
1/ ( a¹ + b⁻¹ ) = b/4
1 = b( a¹ + b⁻¹ ) / 4
( 1 ) ( 4 ) = ab + bb⁻¹
4 = ab + 1
4 - 1 = ab
3 = ab
Pero nos piden ( ab)⁻¹
entonces
( ab )⁻¹ = ( 3 )⁻¹
( ab )⁻¹ = 1/3
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Respuesta:
B ) ( ab ) ⁻¹ = 1/3
Explicación paso a paso:
Recordemos que x⁻¹ = 1/x
{ ( a⁻¹ )⁻¹ + b⁻¹ }⁻¹ = b/4
{ a¹ + b⁻¹ }⁻¹ = b/4
1/ ( a¹ + b⁻¹ ) = b/4
1 = b( a¹ + b⁻¹ ) / 4
( 1 ) ( 4 ) = ab + bb⁻¹
4 = ab + 1
4 - 1 = ab
3 = ab
Pero nos piden ( ab)⁻¹
entonces
( ab )⁻¹ = ( 3 )⁻¹
( ab )⁻¹ = 1/3