9m^2-6m+2n-n^2
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9m^2-6m+2n-n^29m^2-6m+2n-n^29m^2-6m+2n-n^29m^2-6m+2n-n^2=(3m-1)²-1+2n-n²=(3m-1)²-(n-1
9m^2-6m+2n-n^2
9m^2-6m+2n-n^2
9m^2-6m+2n-n^2
9m^2-6m+2n-n^2
=(3m-1)²-1+2n-n²
=(3m-1)²-(n-1)²
=(3m-1+n-1)(3m-1-n+1)
=(3m+n-2)(3m-n)
(m+2n)-6(m+2n)(2m-n)+9(n-2m) 因式分解
因式分解：(2n-m)^2-6(2n-m)(m+n)+9(m+n)^2
(1),(-m-n)(-m+n) (2),(-m+n)(m-n)
4m^2(m+n)-9n^2(m+n)
(m-n)^9乘(n-m)^8/(m-n)^2
(m-2n)(-m-n)
6（m+n)²-2（m+n)
m-n+2n^2/(m+n)
m^2-6m+9与|n-1|互为相反数,则(m/n-n/m)/(m/n)为?
(m-2n/n-m)-(n/m-n)=
2(m-n)²-m(m-n)
（m-n)(m+n)+(m+n)²-2m²
(3m-2n)^+(3m+2n) (3m-2n)-9(m+n)^
(m-5n)(m-n)-6(m+2n)(m-3n)计算,要有过程
计算(m+4n)(m-n)-6(m+2n)(m-3n)
(m-5n)(m-n)-6(m+2n)(m-3n)
（m+4n)(m-n)-6(m+2n)(m-3n)
（m+4n)(m-n)-6(m+2n)(m-3n),