Respuesta :
[tex]4 \times {10}^{5} + 3. 3 \times 10 {}^{6} = 400000 \\ + 3300000 = 3700000[/tex]
OR
[tex]4 \times {10}^{5} + 3.3 \times {10}^{6} \\ = 0.4 \times 10 {}^{6} + 3.3 \times {10}^{6} \\ = (0.4 + 3.3)10 {}^{6} \\ 3.7 \times {10}^{6} [/tex]
good luck