в) с²-18с+81=(с-9)²=(с-9)(с-9)
г) 9а²+24ах+16х²= (3а+4х)²=(3а+4х)(3а+4х)
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в) с²-18с+81=(с-9)²=(с-9)(с-9)
г) 9а²+24ах+16х²= (3а+4х)²=(3а+4х)(3а+4х)