[8^2009*(-0.125)^2010—2^-3]*(π-3.14)
=[(-0.125*8)^2009*(-0.125)-0.125]*(π-3.14)
=(0.125-0.125)*(π-3.14)
=0
[(2x-y)^2--(2x+y)(2x-y)--2y^2]/2x
=[(2x-y)(2x-y-2x-y)-2y^2]/2x
=-4xy/2x
=-2y
=-4