1,
a)(p+q)^2=p^2+2pq+q^2
б)(p-8)^2=p^2-16p+64
в)(7y-1)^2=49p^2-14y+1
г)(6p+5q)^2=36p^2+60pq+25q^2
д)(p^3-2q^2)^2=p^6-4p^3q^2+4q^4
2.
(7x-2y)^2=49x^2-28xy+4y^2
3.
71^2=(70+1)^2=4900+140+1=5041
(23целых3/23)^2=-(23+3/23)^2=-(539+6+9/539)=-545+9/539=-544целых530/539