please bantu kalori ngak guard dia pukulan guru please

jawab

[tex] \frac{a b^{-1}\, - \, a^{-1} b}{ a^{-1}\, +\, b^{-1} }\,= [/tex]

[tex]=\, (\frac{a b^{-1}\, - \, a^{-1} b}{ a^{-1}\, +\, b^{-1} })\,( \frac{ab}{ab}) [/tex]

[tex]=\, (\frac{a^{2}\, - \, b^{2} }{ b\, +\, a })[/tex]

[tex] =\, \frac{(a+b)(a-b) }{ b\, +\, a }\, =\, (a - b)[/tex]