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(11√3-4√7)/(√3-√7) - (√3+13√7)/(2√3-2√7)=
(22√3-8√7-√3-13√7)/[2(√3-√7)]=(21√3-21√7)/[2(√3-√7)]=21/2=10,5
j)
(26√5-23√3)/(3√5-3√3) - (2√5-√3)/(√5-√3) =
(26√5-23√3-6√5+3√3)/[3(√5-√3)]=(20√5-20√3)/[3(√5-√3)]=20/3=6²/₃