7 класс.
Найдите значения выражения:
а)[tex] 23^{2} [/tex]
б)[tex] 19^{2}[/tex]
в)[tex] 81^{2} [/tex]
г) [tex] 49^{2} [/tex]
д) [tex] 1,3^{2} [/tex]
е)[tex] 1,9^{2} [/tex] 
ж)[tex] \frac{7}{2}^{2} [/tex]
з)[tex] \frac{19}{4}^{2} [/tex]
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