1、（x^2+13x+42)/(x+6) 2、[（m+n)^2-4(m-n)^2]/(3n-m)

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1、（x^2+13x+42)/(x+6) 2、[（m+n)^2-4(m-n)^2]/(3n-m)
1、（x^2+13x+42)/(x+6) 2、[（m+n)^2-4(m-n)^2]/(3n-m)

1、（x^2+13x+42)/(x+6) 2、[（m+n)^2-4(m-n)^2]/(3n-m)
1、（x^2+13x+42)/(x+6)=(x+7)(x+6)/(x+6)=x+7
2、[（m+n)^2-4(m-n)^2]/(3n-m)
=[m+n+2(m-n)][m+n-2(m-n)] /(3n-m)
=(3m-n)(-m+3n)/(3n-m)=3m-n

1、（x^2+13x+42)/(x+6)=(x+7)(x+6)/(x+6)=x+7
2、[（m+n)^2-4(m-n)^2]/(3n-m)
=[m+n+2(m-n)][m+n-2(m-n)] /(3n-m)
=(3m-n)(-m+3n)/(3n-m)
=3m-n

（x^2+13x+42)/(x+6)=(x+7)(x+6)/(x+6)
=x+7；
[（m+n)^2-4(m-n)^2]/(3n-m)
=[（m+n)^2-(2m-2n)^2]/(3n-m)
=（3m-n）;

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