先化简(X+Y)(X-Y)-(4X的三次方Y-8X Y的三次方 )÷2XY

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先化简(X+Y)(X-Y)-(4X的三次方Y-8X Y的三次方 )÷2XY

先化简(X+Y)(X-Y)-(4X的三次方Y-8X Y的三次方 )÷2XY
先化简(X+Y)(X-Y)-(4X的三次方Y-8X Y的三次方 )÷2XY

先化简(X+Y)(X-Y)-(4X的三次方Y-8X Y的三次方 )÷2XY
(x+y)(x-y)-(4x³y-8xy³)÷2xy
=x²-y²-(2xy)(2x²-4y²)÷2xy
=x²-y²-(2x²-4y²)
=3y²-x²