a)x^2-4
b)y^2-s^2
в)25-z^2
г)-t^2+49
д)4a^2-b^2
е)x^2-9y^2
ж)49z^2-9t^2
з)9n^2-81m^2
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Answers & Comments
a)x^2-4
b)y^2-s^2
в)25-z^2
г)-t^2+49
д)4a^2-b^2
е)x^2-9y^2
ж)49z^2-9t^2
з)9n^2-81m^2