y²-x²/5x²-4xy除以x+y/5x-4y麻烦你啦.

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y²-x²/5x²-4xy除以x+y/5x-4y麻烦你啦.
y²-x²/5x²-4xy除以x+y/5x-4y
麻烦你啦.

y²-x²/5x²-4xy除以x+y/5x-4y麻烦你啦.
y²-x²/5x²-4xy÷x+y/5x-4y
=(x+y)(y-x)/x(5x-4y)÷x+y/5x-4y
=y-x/x
=-1