(x+3)²-x²=(x+y)²(x-y)²=(x-2y+3z)(x+2y-3z)=(2n+1)(4n²-1)(2n-1)=
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(x+3)²-x²=(x+y)²(x-y)²=(x-2y+3z)(x+2y-3z)=(2n+1)(4n²-1)(2n-1)=
(x+3)²-x²=
(x+y)²(x-y)²=
(x-2y+3z)(x+2y-3z)=
(2n+1)(4n²-1)(2n-1)=
(x+3)²-x²=(x+y)²(x-y)²=(x-2y+3z)(x+2y-3z)=(2n+1)(4n²-1)(2n-1)=
(x+3)²-x²
=x²+6x+9-x²
=6x+9
(x+y)²(x-y)²
=[(x+y)(x-y)]²
=(x²-y²)²
=x的4次方-2x²y²+y的4次方
(x-2y+3z)(x+2y-3z)
=[x-(2y-3z)][x+(2y-3z)]
=x²-(2y-3z)²
=x²-4y²+12yz-9z²
(2n+1)(4n²-1)(2n-1)
=(2n+1)(2n-1)(4n²-1)
=(4n²-1)²=16n的4次方-8n²+1
发工程部分个百分点小高峰会给你几个
(x+3)²-x²=x²+6x+9-x²=6x+9
(x+y)²(x-y)²=((x+y)(x-y))²=(x²-y²)²