Ответ:
1) (y²-10y+25)/(y-5)=(y-5)²/(y-5)=(y-5)
2)(a+b+a-b)/2c=2a/2c=a/c
3)(5a-5b)/(a-b)=5(a-b)/(a-b)=5
4)(n+1-n)/n(n-5)=1/(n(n-5))
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Ответ:
1) (y²-10y+25)/(y-5)=(y-5)²/(y-5)=(y-5)
2)(a+b+a-b)/2c=2a/2c=a/c
3)(5a-5b)/(a-b)=5(a-b)/(a-b)=5
4)(n+1-n)/n(n-5)=1/(n(n-5))