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A = (10^9 x 10^2)/10^7

A = 10^(9+2-7)

A = 10^(11-7)

A = 10^4

B = (10^5 x 10^2)/10^9

B = 10^(5+2-9)

B = 10^(7-9)

B = 10^(-2)

C = (10^6 x 10^3)/10^9

C = 10^(6+3-9)

C = 10^(9-9)

C = 10^0

C = 1

D = (10^4)^3/10^(-2)

D = 10^(4*3+2)

D = 10^(12+2)

D = 10^14