x方-y方+2x+1等于?
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x方-y方+2x+1等于?x方-y方+2x+1等于?x方-y方+2x+1等于?x方-y方+2x+1=(x^2+2x+1)-y^2=(x+1)^2-y^2=(x+y+1)(x-y+1)x方-y方+2x+
x方-y方+2x+1等于?
x方-y方+2x+1等于?
x方-y方+2x+1等于?
x方-y方+2x+1
=(x^2+2x+1)-y^2
=(x+1)^2-y^2
=(x+y+1)(x-y+1)
x方-y方+2x+1
=x方+2x+1-y方
=(x+1)方-y方
=(x+1+y)(x+1-y)
X方-y方+2x+1
=(X方+2X+1)-Y方
=(X+1)方-Y方
=(X+1+Y)(X+1-Y)
x方-y方+2x+1等于?
x方y方-x方-y方+1因式分解
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