1
1)2p/(2p+q)-4p²/(2p+q)²=(4p²+2pq-4p²)/(2p+q)²=2pq/(2p+q)²
2)2p/[(2p-q)(2p+q)]-1/(2p-q)=(2p-2p-q)/[(2p-q)(2p+q)]=q/[(q-2p)(2p+q)]
3)2pq/(2p+q)² :q/[(q-2p)(2p+q)]=2pq/(2p+q)² *(q-2p)(2p+q)/q=
=2p(q-2p)/(2p+q)
2
1)2m/(n+2m)-4m²/(n+2m)²=(2nm+4m²-4m²)/(n+2m)²=2nm/(n+2m)²
2)2m/[(n-2m)(n+2m)]-1/(n-2m)=(2m-n-2m)/[(n-2m)(n+2m)]=n/[(2m-n)(n+2m)]
3)2nm(n+2m)² : n/[(2m-n)(n+2m)]=2nm(n+2m)² * (2m-n)(n+2m)/n=
=2m(2m-n)/(n+2m)