a3=4k+4
a2=4k+4-4k=4k
a1=4k-4
ответ: 4k-4, 4k, 4k+4
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a3=4k+4
a2=4k+4-4k=4k
a1=4k-4
ответ: 4k-4, 4k, 4k+4