s²-r²+16s+64=(s+8)²-r²=(s+8-r)•(s+8+r)
за формулой a²+2ab+b²=(a+b)²
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s²-r²+16s+64=(s+8)²-r²=(s+8-r)•(s+8+r)
за формулой a²+2ab+b²=(a+b)²