(2x-y+1)(2x+y+1)怎么做?
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(2x-y+1)(2x+y+1)怎么做?(2x-y+1)(2x+y+1)怎么做?(2x-y+1)(2x+y+1)怎么做?=(2x+1+y)(2x+1-y)=(2x+1)²-y²=4
(2x-y+1)(2x+y+1)怎么做?
(2x-y+1)(2x+y+1)怎么做?
(2x-y+1)(2x+y+1)怎么做?
=(2x+1+y)(2x+1-y)
=(2x+1)²-y²
=4x²+4x+1-y²
令2x+1为Z
则原式化为 （Z-y）×（Z+y）＝Z^2-y^2＝(2x+1)^2-y^2＝4x^2+4x+1-y^2
(2x+1+y)(2x+1-y)=4x^2+2x-2xy+2x+1-y+2xy+y-y^2=4x^2+4x-y^2+1
(2x+1+y)(2x+1-y)=(2x+1)^2-y^2=4x^2+4x+1-y^2
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