а) 16m²+40mn+25n²
б) 4z²-12zt+9t²
в) 81p²-126pq+49q²
г) 64r²+176rs+121s²
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а) 16m²+40mn+25n²
б) 4z²-12zt+9t²
в) 81p²-126pq+49q²
г) 64r²+176rs+121s²