Question

1_ *Calcule os numeros em notação científica.*

a) 700000000 . 300000

b) 2000000 . 0,000002

c) 0,000294 . 0,00001

d) 0,000008 : 80000

e) 30000000 : 50000

f) 900000000 : 0,00003

Answer 1

a) 700000000 . 300000 =

$7 \times {10}^{8} \times 3 \times {10}^{5} = 21 \times {10}^{13} = 2.1 \times {10}^{14}$

b) 2000000 . 0,000002

$2 \times {10}^{6} \times 2 \times {10}^{ - 6} = 4$

c) 0,000294 . 0,00001

$2.94 \times {10}^{ - 4} \times 1 \times {10}^{ - 5} = 2.94 \times {10}^{ - 9}$

d) 0,000008 : 80000

$8 \times {10}^{ - 6} \div 8 \times {10}^{4} = 1 \times {10}^{ - 10}$

e) 30000000 : 50000

$3 \times {10}^{7} \div 5 \times {10}^{4} = 0.6 \times {10}^{3} = 6 \times {10}^{ - 1} \times {10}^{3} = 6 \times {10}^{2}$

f) 900000000 : 0,00003

$9 \times {10}^{8} \div 3 \times {10}^{ - 5} = 3 \times {10}^{13}$