№348-1
(29-х²)/(х-√29)=(√29-х)(√29+х)/(-(√29-х))=-(√29+х)=-х-√29
№348-2
(√31+у)/(у²-31)=(√31+у)/((у-√31)(у+√31))=1/(у-√31)
№348-3
(z²-2√7z+7)/(7-z²)=(z-√7)²/((√7-z)(√7+z))=(√7-z)/(√7+z)
№348-4
(121-m)/(m+22√m+121)=((11-√m)(11+√m))/(√m+11)²=(11-√m)/(11+√m)
№349-1
(2x-2y)/(√13x+√13y)=2(√х-√у)(√х+√у)/(13(√х+√у))=2(√х-√у)/(13(√х+√у))
№349-2
(2m-6√2)/(m²-18)=2(m-3√2)/((m-3√2)(m+3√2))=2/(m+3√2)
№349-3
(√(2b)+√(10c))/(b-5c)=√2(√b+√5c)/((√b-√5c)(√b+√5c))=√2/(√b-√5c)
№349-4
(n²-6m)/(n²-n√(24)m+6m)=(n-√(6m))(n+√(6m))/(n-√(6m))²=(n+√(6m))/(n-√(6m))