Explicación paso a paso:
a)
[tex]725434 \\ 7 \times {10}^{5} + 2 \times {10}^{4} + 5 \times {10}^{3} + 4 \times {10}^{2} + 3 \times 10 + 4[/tex]
b)
[tex]590793 \\ 5 \times {10}^{5} + 9 \times {10}^{4} + 7 \times {10}^{2} + 9 \times {10}^{1} + 3[/tex]
