326. Представьте в виде квадрата двуч.
1) 9a2-24ab+16b2; 4) 4c2+12c+9;
2) 25х2+10x+1; 5) 81х2-18xy+y2;
3) m2+4n2-4mn; 6) 100a2+b2+2ab.​
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