Question

adevarat sau fals?$( \frac{3^{3}x ^{-1}y ^{-2} }{54 x^{-2}y } ) ^{-1} = \frac{2x}{y}$

Answer 1

{[3^3* x^(-1)*y^(-2)]/[54x^(-2)*y]}^(-1)=
={[27* x^(-1)*y^(-2)]/[54x^(-2)*y]}^(-1)=        simplificam cu 27*x^(-1)*y^(-1)
={y^(-1)/2*x(-1)}^(-1)=
=1/y * 2x= 2x/y