tolong yng jago matematika nomer 3 dan 4 dengan caranya yang paling lengkap banget

3)
...a^10.........b^2
------------× --------
243b^5.....2a^3

.......a^7
= ------------
.....486b^3

4)

.....(x^4 a^3 y^2)(-a^3 b^3 x^3)(-x^3)
= --------------------------------------------------
...(a^2 b^2 x^2 y^2)(a^8 b^4 x^8 y^4)

...(-a^6 b^3 -x^10 y^2)
= -----------------------------
....(a^10 b^6 x^10 y^6)

.....................1
= ---------------------------
.....-a^4 b^3 -1 y^4

............1
= -------------------
.....a^4 b^3 y^4