2+y²/y³-y-1/y²=2+y²-y×(y-1)/y³=2+y²-y²+y/y³=2+y/y³.
m-2n/mn²+2m-n/m²n=m×(m-2n)+n×(2m-n)/m²n²=m²-2mn+2mn-n²/m²n²=m²-n²/m²n².
7/x⁸+5-7x²/x¹⁰=7x²+5-7x²/x¹⁰=5/x¹⁰.
mn-n/m-mn-m/n-m²-n²/mn=n×(mn-n)-m×(mn-m)-(m²n²)/mn=mn²-n²-m²n+m²-m²+n²/mn=mn×(n-m)/mn=n×(n-m)/n=n-m.
3p-q/3p³q²-2q-p/2p²q³=2q×(3p-q)-3p×(2q-p)/6p³q³=6pq-2q²-6pq+3p²/6p³q³=-2q²+3p²/6p³q³.
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2+y²/y³-y-1/y²=2+y²-y×(y-1)/y³=2+y²-y²+y/y³=2+y/y³.
m-2n/mn²+2m-n/m²n=m×(m-2n)+n×(2m-n)/m²n²=m²-2mn+2mn-n²/m²n²=m²-n²/m²n².
7/x⁸+5-7x²/x¹⁰=7x²+5-7x²/x¹⁰=5/x¹⁰.
mn-n/m-mn-m/n-m²-n²/mn=n×(mn-n)-m×(mn-m)-(m²n²)/mn=mn²-n²-m²n+m²-m²+n²/mn=mn×(n-m)/mn=n×(n-m)/n=n-m.
3p-q/3p³q²-2q-p/2p²q³=2q×(3p-q)-3p×(2q-p)/6p³q³=6pq-2q²-6pq+3p²/6p³q³=-2q²+3p²/6p³q³.
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