(m+n)^2-8(m^2-n^2)+16(m-n)^2= 用因式分解
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(m+n)^2-8(m^2-n^2)+16(m-n)^2= 用因式分解
(m+n)^2-8(m^2-n^2)+16(m-n)^2= 用因式分解
(m+n)^2-8(m^2-n^2)+16(m-n)^2= 用因式分解
(m+n)^2-8(m^2-n^2)+16(m-n)^2
=(m+n)^2-2×4(m-n)(m+n)+[4(m-n)]^2
=[(m+n)-4(m-n)]^2
=(m+n-4m+4n)^2
=(-3m+5n)^2
=(5n-3m)^2
(1),(-m-n)(-m+n) (2),(-m+n)(m-n)
(m-n)^9乘(n-m)^8/(m-n)^2
(m-2n)(-m-n)
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m-n+2n^2/(m+n)
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1/(m-n)-1/(m+n)-2n/(m^2+n^2)-4n^3/m^4+n^4)-8n^7/(m^8+n^8)-16n^15/(m^16+n^16)+32n^31/(n32-m32)
(m-2n/n-m)-(n/m-n)=
2(m-n)²-m(m-n)
(m-n)(m+n)+(m+n)²-2m²
C(m,n)=n(n-1)(n-2)...(n-m+1)/m!中的!
+(n+1)!/1!+(n+2)!/2!+.+(n+m)!/m!,
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[(m+n)(m-n)-(m-n)²+2n(m-n)]÷4n
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