化简下列分式 1.(a²+5ab)/(5b²+ab) 2.(n²-9)/(3n-n²)
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化简下列分式 1.(a²+5ab)/(5b²+ab) 2.(n²-9)/(3n-n²)
化简下列分式 1.(a²+5ab)/(5b²+ab) 2.(n²-9)/(3n-n²)
化简下列分式 1.(a²+5ab)/(5b²+ab) 2.(n²-9)/(3n-n²)
1.(a²+5ab)/(5b²+ab)
=a(a+5b)/b(5b+a)
=a/b
2.(n²-9)/(3n-n²)
=(n+3)(n-3)/-n(n-3)
=-(n+3)/n