663 851 : x = 897 9187 – y + 409 = 89 mũ 2 – 102 8.6 + 288 : [ x – 3] 2 = 50 48751 – [ 10425 + y ] = 3828:12

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1. a.

   `663851 : x = 897`

   `⇔x = 663851 : 897`

   `⇔x = 663851/897`

   b.

   `9187 – y + 409 = 89^2 – 102`

   `⇔9187 – y + 409 = 7921 – 102`

   `⇔9187 – y = 7921 – 102 – 409`

   `⇔9187 – y = 7410`

   `⇔y = 9187 – 7140`

   `⇔y = 1777`

   c.

   `8*6 + 288 : (x-3)2 = 50`

   `⇔48 + 288 : (x – 3)2 = 50`

   `⇔288 : (x -3)2 = 2`

   `⇔(x – 3)2 = 144`

   `⇔x – 3 = 72`

   `⇔x = 75`

   d.

   `48751 – (10425 + y) = 3828 : 12`

   `⇔48751 – (10425 + y) = 319`

   `⇔10425 + y = 48751 – 319`

   `⇔10425 + y = 48432`

   `⇔x = 48432 – 10425`

   `⇔x = 38007`

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