5x²+5xy/x²-y²·（4x-4y)计算!急
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5x²+5xy/x²-y²·（4x-4y)计算!急5x²+5xy/x²-y²·（4x-4y)计算!急5x²+5xy/x²
5x²+5xy/x²-y²·（4x-4y)计算!急
5x²+5xy/x²-y²·（4x-4y)计算!急
5x²+5xy/x²-y²·（4x-4y)计算!急
=5x(x+y)*4(x-y)/[(x+y)*(x-y)]=20x
太难了！