1) 9а²-6а+1=(3а-1)²=(3a-1)(3a-1)
2) 1+2с+с²=с²+2с+1=(с+1)²=(c+1)(c+1)
3) 36b²+12b+1=(6b+1)²=(6b+1)(6b+1)
4) 81-18x+x²=x²-18x+81=(x-9)²=(x-9)(x-9)
1) 9а²-6а+1=(3а-1)²=(3a-1)(3a-1)
2) 1+2с+с²=с²+2с+1=(с+1)²=(c+1)(c+1)
3) 36b²+12b+1=(6b+1)²=(6b+1)(6b+1)
4) 81-18x+x²=x²-18x+81=(x-9)²=(x-9)(x-9)
3) (6b+1)(6b+1)