(0,2x-0,5)^2=0,04x^2-0,2x+0,25
(1/2m+3n)^2=1/4m^2+3nm+9n^2
(C^2+d^2)^2=c^4+2c^2d^2+d^4
(M^2-n^3)^2=m^4-2m^2n^3+n^5
79^2=6241
39^2=1521
(X+1)^2=x^2+2x+1
(Y-2)^2=y^2-4y+4
(-x+1)^2=x^2-2x+x^2
(-z-3)^2=z^2+6z+9
(8x+3y)^2=64x^2+48xy+9y^2
(6m-4n)^2=36m^2-48mn+16n^2