1) 6х(2х-5у)/6х(5х-2у)=2x-5y/5x-2y
2) 6a(6a+4b)/6a(4a+6b)=6a+4b/4a+6b
3) m³-3m²n/3m²n-3m²=m²(m-3n)/3m²(n-1)=m-3n/3(n-1)
4) a³-2a²b/2a³b²-a⁴b=a²(a-2b)/a³b(2b-a)=-a²/a³b
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Answers & Comments
1) 6х(2х-5у)/6х(5х-2у)=2x-5y/5x-2y
2) 6a(6a+4b)/6a(4a+6b)=6a+4b/4a+6b
3) m³-3m²n/3m²n-3m²=m²(m-3n)/3m²(n-1)=m-3n/3(n-1)
4) a³-2a²b/2a³b²-a⁴b=a²(a-2b)/a³b(2b-a)=-a²/a³b