Answer
a) $200000000000$
b) $0.000005$
Work Step by Step
a) $\frac{6\cdot10^8}{3\cdot10^{-3}}=2\cdot10^{8+3}=2\cdot10^{11}=200000000000$
b) $\frac{2.5\cdot10^{-3}}{5\cdot10^{2}}=0.5\cdot10^{-5}=0.000005$
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