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20 September, 10:19

5.22x10-3 = [? ]x 10-2

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  1. 20 September, 10:21
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    5.12

    Explanation:

    5.22 x 10 - 3 = [?] x 10 - 2 (move - 2 to the other side with changed sign)

    5.22 x 10 - 3 + 2 = [?] x 10 (divide both sides by 10)

    [?] = (5.22 x 10 - 1) / 10

    [?] = 5.12
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