Question

II-Efetue as operações:​

Answer 1

Explicação passo-a-passo:

$14)(5.11 \times {10}^{2} ) - (4.2 \times {10}^{2} ) \\ = 511 - 420 \\ = 91$

$16)(6.3 \times {10}^{ - 2} ) - (2.1 \times {10}^{ - 1} ) \\ = 0.063 - 0.21 \\ = - 0.147 \\ = 1.47 \times {10}^{ - 1}$

$18)(2 \times {10}^{7} )(3 \times {10}^{9} ) \\ = (2 \times 3) {10}^{7 + 9} \\ = 6 \times {10}^{16}$

$20)(3.45 \times {10}^{8} ) \div (6.74 \times {10}^{ - 2} ) \\ = (3.45 \div 6.74) {10}^{8 - ( - 2)} \\ = 0.511 \times {10}^{10}$

$22)(4.7 \times {10}^{ - 2}) \div (5.7 \times {10}^{ - 6} \\ = (4.7 \div 5.7) {10}^{ - 2 - ( - 6)} \\ = 0.82 \times {10}^{4}$