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Najpierw uprościmy wyrażenie : [(x/y)³:(x/y)⁻²]²*(x/y)⁻⁷ czyli:
[(x/y)³:(x/y)⁻²]²*(x/y)⁻⁷ = (x/y)⁶:(x/y)⁻⁴*(x/y)⁻⁷(x/y)⁶⁺⁴⁻⁷=(x/y)³
i:
y=(½)⁻¹=2
(x/y)³=(½/2)³=(½:2)³=(½*½)³=(¼)³=1/64
b)[(⅛a):(¼a²)²]*(a*½)⁴= ,dla a=(-2)⁻¹
również upraszczamy:
[(⅛a):(¼a²)²]*(a*½)⁴= [(⅛a):(1/16a⁴)]*(1/16a⁴)=2a⁻³*1/16a⁴=⅛a
a=(-2)-1=-½
⅛*(-½)=-1/16
:)