因式分解:m(m-1)x^2 - (2m^2 -1)x + m(m+1) =0[mx - ( m +1 )] [(m-1)x -m]=0怎么得出的...如果是十字相乘...m + (m+1) 怎么等于 -(2m^2 -1)

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因式分解:m(m-1)x^2-(2m^2-1)x+m(m+1)=0[mx-(m+1)][(m-1)x-m]=0怎么得出的...如果是十字相乘...m+(m+1)怎么等于-(2m^2-1)因式分解:m(

因式分解:m(m-1)x^2 - (2m^2 -1)x + m(m+1) =0[mx - ( m +1 )] [(m-1)x -m]=0怎么得出的...如果是十字相乘...m + (m+1) 怎么等于 -(2m^2 -1)
因式分解:m(m-1)x^2 - (2m^2 -1)x + m(m+1) =0
[mx - ( m +1 )] [(m-1)x -m]=0
怎么得出的...
如果是十字相乘...m + (m+1) 怎么等于 -(2m^2 -1)

因式分解:m(m-1)x^2 - (2m^2 -1)x + m(m+1) =0[mx - ( m +1 )] [(m-1)x -m]=0怎么得出的...如果是十字相乘...m + (m+1) 怎么等于 -(2m^2 -1)
十字相乘 m -( m+1 )
m-1 -m
-m*mx-(m+1)(m-1)x
=-m^2x-(m^2-1)x
=(-m^2-m^2+1)x
=-(2m^2-1)x