[(x-2y)^2+4(x+y)(x-y)]除以2x=(x²-4xy+4y²+4x²-4y²)÷2x=(5x²-4xy)÷2x=5x/2-2y当x=2,y=1.5时原式=5-3=2
=(5X ²-4 XY)÷2x=5x/2-2y=2
=(x^2+4y^2-4xy+4x^2-4y^2)/2x=(5x^2-4xy)/2x=(5x-4y)/2=2