Bonjour pourriez vous m'aidez a faire cet exercice s'il vousplait merci d'avance

1) 1/(15^(-7))=(15^(-2))/(15^(-7)*15^(-2))
                     =(15^(-2))/(15^(-9))
                     =(15^(-2))/(5^(-9)*3^(-9))

2) (5^(-3))/(25^(-2))=1/(5^3*5^(-2)*(5^(-2))
                              =1/(5^(-1))
                              =5
                              =5*5^11/(5^11)
                              =125^4/(5^11)

3) 101,10101=101101010*10^(-6)