Question

Efetue a subtração ( 30,9. 10^5 - 9,05. 10^5)

A) 21,45 × 10^ 5
B) 21,85 × 10
C) 21,45 × 10^5
D) 21,85 × 10^ 5
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Answer 1

$\mathsf{30,9\cdot10^5-9,05\cdot10^5=21,85\cdot10^5}$