Question

calcule as operações:
a)2,7.10^-3×3,1.10^7
b)5,4.10^-8:1,2,10^3​

Answer 1

a)

$2.7 \times 10 {}^{ - 3} \times 3.1 \times 10 {}^{7}$

• Multiplique ambos os coeficientes e perfeça somando ambas às bases.

$2.7 \times 3.1 = 8.37$

$8.37 \times 10 {}^{ \: - 3 \: + \: 7 \: = \: 4}$

$\red{8.37 \times 10 {}^{4}}$

b)

$5,4 \: . \: 10 {}^{ - 8} \: ÷ \: 1,2 \: . \: 10³$

$0,000000054 \: / \: 1200 =0,000000000045 → \red{4,5 \: . \: 10 {}^{ - 11}}$