a)
[tex]a + b = 6 \times {10}^{7} + 2.5 \times {10}^{6} = 60000000 + 2500000 = 62500000 = 6.25 \times {10}^{7} [/tex]
[tex]a - b = 6 \times {10}^{7} - 2.5 \times {10}^{6} = 60000000 - 2500000 = 57500000 = 5.75 \times {10}^{7} [/tex]
b)
[tex]a + b = 5.2 \times {10}^{ - 4} + 3.7 \times {10}^{ - 5} = 0.00052 + 0.000037 = 0.000557 = 5.57 \times {10}^{ - 4} [/tex]
[tex]a - b = 5.2 \times {10}^{ - 4} - 3.7 \times {10}^{ - 5} = 0.00052 - 0.000037 = 0.000483 = 4.83 \times {10}^{ - 4} [/tex]
c)
[tex]a + b = 1.2 \times {10}^{13} + 9.8 \times {10}^{12} = 12000000000000 + 9800000000000 = 20800000000000 = 2.08 \times {10}^{13} [/tex]
[tex]a - b = 1.2 \times {10}^{13} - 9.8 \times {10}^{12} = 12000000000000 - 9800000000000 = 2200000000000 = 2.2 \times {10}^{12} [/tex]
