计算 x²/(x+y) - (x-y)
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计算 x²/(x+y) - (x-y)
计算 x²/(x+y) - (x-y)
计算 x²/(x+y) - (x-y)
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原式=(x²-(x-y)(x+y))/(x+y)
=(x²-(x²-y²))/(x+y)
=y²/(x+y)
计算 x²/(x+y) - (x-y)
计算 x²/(x+y) - (x-y)
计算 x²/(x+y) - (x-y)
/>
原式=(x²-(x-y)(x+y))/(x+y)
=(x²-(x²-y²))/(x+y)
=y²/(x+y)