Формула a²-b²=(a-b)(a+b)
(u+13v)²-(13u+v)² = (u+13v-13u-v)(u+13v+13u+v) = (12v-12u)(14v+14u) = 12*14(v-u)(v+u) = 168(v²-u²)
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Формула a²-b²=(a-b)(a+b)
(u+13v)²-(13u+v)² = (u+13v-13u-v)(u+13v+13u+v) = (12v-12u)(14v+14u) = 12*14(v-u)(v+u) = 168(v²-u²)