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

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`