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а) \(\sqrt{2\cdot8}=\sqrt{16}=4\);

б) \(\sqrt{27\cdot3}=\sqrt{81}=9\);

в) \(\sqrt{28\cdot7}=\sqrt{196}=14\);

г) \(\sqrt{2\cdot32}=\sqrt{64}=8\);

д) \(\sqrt{13\cdot52}=\sqrt{676}=26\);

е) \(\sqrt{63\cdot7}=\sqrt{441}=21\);

ж) \(\sqrt{50\cdot4{,}5}=\sqrt{225}=15\);

з) \(\sqrt{1{,}2\cdot3\frac13}=\sqrt4=2\).