4) = b^(13+1+21+20) = b^55
5) = (4^2)^4 x 4^10 x (4^3)^5 = 4^8 x 4^10 x 4^15 = 4^(8+10+15) = 4^33
6) = c^(58-39-9)= c^10
7) = (5^3)^42 : (5^2)^63 = 5^126 : 5^126 = 1
8) = ((2^3)^37 x (3^4)^25) : ((2^4)^27 x (3^3)^33) =
2^111 x 3^100 / 2^108 x 3^99 =
2^(111-108) x 3^(100-99)=
2^3 x 3 = 8 x 3 = 24
9) = 2^[( 45(45+1)]:2) = 2^([45x46]:2) = 2^(1035)
10) = 1