5.7. Представьте трехчлен в виде квадрата двучлена: 1) 9a2-24ab+1662; 2) 4c²+12c+9; 3) 25x²+10x+1; 4) 81x2-18xy+y2; 5) m2+4n²-4mn; 6) 100a²+b2+20ab.​
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