计算:(1)x²•x³+x^7∕x² (2)[(x-y)²+(x+y
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计算:(1)x²•x³+x^7∕x² (2)[(x-y)²+(x+y)(x-y)]∕2x
(1) 2x^6
(2) =(x²+y²-2xy+x²-y²)/2x
=(2x²-2xy)/2x
=x-y
(2) =(x²+y²-2xy+x²-y²)/2x
=(2x²-2xy)/2x
=x-y
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