a) [tex] \frac{7 x^{-3} }{28 x^{-4} } = \frac{ x^{-3} }{4 x^{-4} }= \frac{ x^{4} }{4 x^{3} }= \frac{ x }{4 }[/tex]
b) Nu se intelege prea bine daca este [tex] ( \frac{1}{2} * b^{-3} )^{-2} = ( 2^{-1})^{-2} * (b^{-3} )^{-2}= 2^{2} * b^{6} =2^{2} * b^{6}=4*b^{6} [/tex]
c) [tex] ( \frac{1}{10} * y^{2} )^{-3} = ( 10^{-1} )^{-3} * y^{-6} = 10^{3} *y^{-6}= \frac{10^{3} }{y^{6}} [/tex]
Sper ca am inteles corect.
