Question

Subtraia as notações científicas abaixo: A) 8,7.108 – 7,5.108 B) 6,6.103 – 8,4.102

Answer 1

$8.7 \times {10}^{8} - 7.5 \times {10}^{8} = (8.7 - 7.5) \times {10}^{8}$

$= 1.2 \times {10}^{8}$

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$6.6 \times {10}^{3} - 8.4 \times {10}^{2} = 66 \times {10}^{2} - 8.4 \times {10}^{2}$

$= (66 - 8.4) \times{10}^{2} = 57.6 \times {10}^{2}$

$= 5.76 \times {10}^{3}$