a)
[tex]2.7 \times 10 {}^{ - 3} \times 3.1 \times 10 {}^{7} [/tex]
• Multiplique ambos os coeficientes e perfeça somando ambas às bases.
[tex]2.7 \times 3.1 = 8.37[/tex]
[tex]8.37 \times 10 {}^{ \: - 3 \: + \: 7 \: = \: 4} [/tex]
[tex]\red{8.37 \times 10 {}^{4}}[/tex]
b)
[tex]5,4 \: . \: 10 {}^{ - 8} \: ÷ \: 1,2 \: . \: 10³[/tex]
[tex]0,000000054 \: / \: 1200 =0,000000000045 → \red{4,5 \: . \: 10 {}^{ - 11}}[/tex]
