Calcula, apresentando o resultado em notação científica

Cálculo e apresentação do resultado em notação científica:

1. 
   \(2,4 \times {10^5} + 3,21 \times {10^5} = \left( {2,4 + 3,21} \right) \times {10^5} = 5,61 \times {10^5}\)
2. 
   \(4,7 \times {10^4} – 3,4 \times {10^4} = \left( {4,7 – 3,4} \right) \times {10^4} = 1,3 \times {10^4}\)
3. 
   \(3,12 \times {10^{16}} + 4,2 \times {10^{18}} = 0,0312 \times {10^{18}} + 4,2 \times {10^{18}} = \left( {0,0312 + 4,2} \right) \times {10^{18}} = 4,2312 \times {10^{18}}\)
4. 
   \( – 5,3 \times {10^{32}} + 0,4 \times {10^{30}} = – 5,3 \times {10^{32}} + 0,004 \times {10^{32}} = \left( { – 5,3 + 0,004} \right) \times {10^{32}} = – 5,296 \times {10^{32}}\)
5. 
   \(3,7 \times {10^{29}} – 7,4 \times {10^{30}} = 0,37 \times {10^{30}} – 7,4 \times {10^{30}} = \left( {0,37 – 7,4} \right) \times {10^{30}} = – 7,03 \times {10^{30}}\)
6. 
   \(5,02 \times {10^{ – 27}} + 7,89 \times {10^{ – 26}} = 0,502 \times {10^{ – 26}} + 7,89 \times {10^{ – 26}} = \left( {0,502 + 7,89} \right) \times {10^{ – 26}} = 8,392 \times {10^{ – 26}}\)
7. 
   \(1,025 \times {10^{17}} \times 8,2 \times {10^{ – 2}} = \left( {1,025 \times 8,2} \right) \times \left( {{{10}^{17}} \times {{10}^{ – 2}}} \right) = 8,405 \times {10^{15}}\)
8. 
   \[\left( {4,5 \times {{10}^{13}}} \right) \div \left( {1,5 \times {{10}^{ – 21}}} \right) = \frac{{4,5 \times {{10}^{13}}}}{{1,5 \times {{10}^{ – 21}}}} = \frac{{4,5}}{{1,5}} \times \frac{{{{10}^{13}}}}{{{{10}^{ – 21}}}} = 3 \times {10^{34}}\]