计算;1、【(x-y)²+(x+y)(x-y)】/2x2、(a+2b-1)(a-2b+1)
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计算;1、【(x-y)²+(x+y)(x-y)】/2x2、(a+2b-1)(a-2b+1)
计算;1、【(x-y)²+(x+y)(x-y)】/2x
2、(a+2b-1)(a-2b+1)
计算;1、【(x-y)²+(x+y)(x-y)】/2x2、(a+2b-1)(a-2b+1)
(1)
【(x-y)²+(x+y)(x-y)】/2x
=(x²-2xy+y²+x²-y²)/(2x)
=(2x²-2xy)/(2x)
=2x(x-y)/(2x)
=x-y
(2)
(a+2b-1)(a-2b+1)
=(a+(2b-1))(a-(2b-1))
=a²-(2b-1)²
=a²-(4b²-4b+1)
=a²-4b²+4b-1