1.2x²尘逗+2x-1
=2(x²+x-1/2)
=2(x²+x+1/4-3/4)
=2[(x+1/2)²迅没-3/4]
=2(x+1/2+√3/2)(x+1/2-√3/2)
（2）派昌卖x²-2xy-y²
=(x²-2xy+y²)-2y²
=(x-y)²-2y²
=(x-y+√2y)(x-y-√2y)
（1） 2x²+2x-1
=2(x²+x-1/颤和袭2)
=2(x²+x+1/4-3/4)
=2[(x+1/2)²-3/4]
=2(x+1/2+√3/2)(x+1/2-√茄兄3/2)
（2）x²-2xy-y²
=(x²-2xy+y²棚掘)-2y²
=(x-y)²-2y²
=(x-y+√2y)(x-y-√2y)
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