Write without scientific notation and calculate.

a) [[$ 4 \cdot 10^4 + 2 \cdot 10^3 + 2 \cdot 10^2 +1 \cdot 10^1 + 7 \cdot 10^0 = $]]

b) [[$ 6 \cdot 10^5 + 4 \cdot 10^2 + 6 \cdot 10^1 = $]]

c) [[$ 5 \cdot 10^6 + 7 \cdot 10^3 + 1\cdot 10^0 = $]]

d) [[$ 1 \cdot 10^0 + 1 \cdot 10^{-2} + 9 \cdot 10^{-3} = $]]

e) [[$ 3 \cdot 10^{-1} + 6 \cdot 10^{-4} = $]]

f) [[$ 1,23 \cdot 10^{-3} = $]]