tolong bantu sederhanakan

a.) ((x^5 y^6 : x^2 y^3)^3)^5
= (x^5 y^6 : x^2 y^3)^3x5
= (x^5 y^6 : x^2 y^3) ^15
= (x^5x15 y^6x15 : x^2x15 y^3x15)
= (x^75 y^90 : x^45 y^30)
= (x^75-45 y^90-30)
= ( x^30 y^60) (sederhanakan dengan sama sama di bagi 30 )
= ( x^30:30 y^60:30)
= ( x y^2)
b.) a^3 b^6 : a^5 b^2
= a^3-5 b^6-2
= a^-2 b^4 (sederhanakan dengan sama sama di bagi -2)
= a^-2:(-2) b^4:(-2)
= a b^-2
c.) (27.p^5.q^-3 : 9.p^6.q^-4)
= ( 3^3 .p^5.q^-3 : 3^2.p^6.q^-4)
=(3^3-2 .p^5-6.q^-3-(-4))
= ( 3.p.q)
=3pq