64х² = (8х)²
(8х - А)² = 64х² - 2*8х*А + А²
d = A²
2*8*А = 5
А = 5/16
d = A² = 25/256
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64х² = (8х)²
(8х - А)² = 64х² - 2*8х*А + А²
d = A²
2*8*А = 5
А = 5/16
d = A² = 25/256