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1)=0.25x2-0.5xy+0.5xy-y2=1/4x2-y2
2)=a6+a3b2-a3b2-b4=a6-b4
3)=16a+2ab+2ab+b2/4
4)=4a2/9+2ab-2ab-9b2=4a2/9-9b2
5)=(2x+y+z)*(2x-y-z)=4x2-2xy-2xz+2xy-y2-yz+2xz-yz-z2=4x2-y2-z2
6)=x2+xy+2xz+xy+y2+2yz-2xz-2yz-4z2=x2+2xy+4xz+y2-2yz-2xz-4z2=x2+y2-4z2+2xz+2xy-2yz

1)(0,5х+у)*(0,5х-у)=0,25x-y
2)(a-b)*(a+b)=a^6-b^4
3)(4a-b/2)*(4a+b/2)=16a-b/4
4)(2a/3-3b)*(2a/3+3b)=4a/9-9b
5)(2x+y+z)*(2x-(y+z))=4x-(y+z)
6)(x+y-2z)*(x+y+2z)=(x+y)-4z