完了,我摊上大事了,>_

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完了,我摊上大事了,>_
xn@_%Tf؞e@B۱6P([6lرG U+! B|^F -t7lizab)+HjN_#EcE !h}*SD]mtIwn_~_zg*~Ls}lm~XR

完了,我摊上大事了,>_
完了,我摊上大事了,>_

完了,我摊上大事了,>_

7(x-3)(x+3)
3(a-b)(a+b)
(a+b+c)(x-y)
[x+y-4(x-y)][x+y+4(x-y)]=(5y-3x)(5x-3y)
[(x+y+z)-(x-y-z)](x+y+z+x-y-z)=2(y+z)X2x=4x(y+z)

=7*(x+3)(x-3)
=3(a+b)(a-b)
=(x-y)(a+b+c)
=(x+y+4x-4y)(x+y-4x+4y)=(5x-3y)(5y-3x)
=(x+y+z+x-y-z)(x+y+z-x+y+z)=4x(y+z)

1) 原式=7(x^2-9)
3) 原式=3(a+b)(a-b)
5) 原式=(x-y)(a+b+c)
7) 原式=[x+y+4(x-y)][x+y-4(x-y)]=(5x-3y)(5y-3x)
9) 原式=[x+y+z+(x-y-z)][x+y+z-(x-y-z)]=2x(2y+2z)

不会