因式分解2mn(m+n)(m-n)-m2(m+1)(m-1)+n2(n+1)(n-1) x3+x2+x+6

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因式分解2mn(m+n)(m-n)-m2(m+1)(m-1)+n2(n+1)(n-1) x3+x2+x+6
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因式分解2mn(m+n)(m-n)-m2(m+1)(m-1)+n2(n+1)(n-1) x3+x2+x+6
因式分解2mn(m+n)(m-n)-m2(m+1)(m-1)+n2(n+1)(n-1) x3+x2+x+6

因式分解2mn(m+n)(m-n)-m2(m+1)(m-1)+n2(n+1)(n-1) x3+x2+x+6
2mn(m+n)(m-n)-m2(m+1)(m-1)+n2(n+1)(n-1)
=2mn(m+n)(m-n)-m²(m²-1)+n²(n²-1)
=2mn(m+n)(m-n)-m^4+m²+n^4-n²
=2mn(m+n)(m-n)-(m^4-n^4)+(m²-n²)
=2mn(m+n)(m-n)-(m²-n²)(m²+n²)+(m²-n²)
=(m+n)(m-n)[2mn-(m²+n²)+1]
=(m+n)(m-n)[-(m²-2mn+n²)+1]
=(m+n)(m-n)[1-(m-n)^2]
=(m+n)(m-n)[1+(m-n)][1-(m-n)]
x^3+x^2+x+6
=(x^3 +2x^2)-(x^2 +2x)+(3x+6)
=x^2(x+2)-x(x+2)+3(x+2)
=(x+2)(x^2 -x+3)