1)
(1/2+a)^2=1/4+a+a^2
2)
(m+0,2)^2=m^2+0,4m+0,04
3)
(x+1/3)^2=x^2+2x/3+1/9
4)
(1,1+p)^2=1,21+2,2p+p^2
5)
(1/2a+2/3b)^2=a^2/4+2ab/3+4b^2/9
6)
(3/4x+1,5y)^2=9x^2/16+2,25xy+2,25y^2
7)
(0,2m+2,1n)^2=0,04m^2+0,84mn+4,41n^2
8)
(0,4p+0,3q)^2=0,16p^2+0,24mn+0,09q^2
9)
(3/5ab+1/2c)^2=9a^2b^2/25+0,6abc+c^2/4