Rút gọn phân số : 2^3.3^4 ; 2^4.5^2.11^2.72^2.3^2.5

Rut gon phan so:
a,2^3.3^4 ; 2^4.5^2.11^2.7
2^2.3^2.5    2^3.5^3. 7^2.11
b121.75. 130.169
   39.60.11.198
c, 3^10.(-5)^21
     (-5)^20.3^12
d,2^10.3^10- 2^10.3^9
   2^9.3^10