这怎么做呀！
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解：⑵原式=(x-3)²/(x-1)²(x+2)²×(x+2)/(x-3)²×x²(x-1)²
=x²/(x+2)
13、原式=(x+y)³(x-y)³/(x²+y²)³÷(x+y)⁴/(x²+y²)²(x²-y²)²·(x²+y²)/(x-y)⁴
=(x+y)⁴(x-y)⁴/(x²+y²)⁴·(x²+y²)²(x+y)²(x-y)²/(x+y)⁴·(x²+y²)/(x-y)⁴
=(x+y)(x-y)
将x=555,y=445代入得
原式=(555+445)(555-445)
=1000×110
=110000
愿对你有所帮助！
=x²/(x+2)
13、原式=(x+y)³(x-y)³/(x²+y²)³÷(x+y)⁴/(x²+y²)²(x²-y²)²·(x²+y²)/(x-y)⁴
=(x+y)⁴(x-y)⁴/(x²+y²)⁴·(x²+y²)²(x+y)²(x-y)²/(x+y)⁴·(x²+y²)/(x-y)⁴
=(x+y)(x-y)
将x=555,y=445代入得
原式=(555+445)(555-445)
=1000×110
=110000
愿对你有所帮助！
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