x^2-y^2+2x+1除以x-y+1
1个回答
x^2-y^2+2x+1
=(x^2+2x+1)-y^2
=(x+1)^2-y^2
=(x+1+y)(x+1-y)
所以x^2-y^2+2x+1除以x-y+1 =x+y+1
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