html动画特效:怎麽解1-m^2-n^2+2mn
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1-m^2-n^2+2mn
=1-(m^2+n^2-2mn)
=1-(m-n)^2
=(1+m-n)(1-m+n)
1-m^2-n^2+2mn
=1-(m^2+n^2-2mn)
=1-(m-n)^2
=(1+m-n)(1-m+n)
1-m^2-n^2+2mn
=1-(m^2+n^2-2mn)
=1-(m-n)^2
=(1+m-n)(1-m+n)
怎麽解1-m^2-n^2+2mn
分解因式m^2+mn+n^2
(2m2/2m-n )– (2mn/n-2m) + (mn-2n/2m-n)
分解因式:2m^2 n^2-2n^2+(mn-1)(m-1)^2
m+n=0,那么m^3-m^2n-mn^2+n^3是多少
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