Răspuns :
=3√5-7*{√2+[20√5-2*(√5-9√2):18]}=
=3√5-7*{√2+[20√5-2√5+18√2:18]}=
=3√5-7*{√2+18√5+√2}=
=3√5-7*{2√2+18√5}=
=3√5-14√2-126√5=
=-123√5-14√2
=3√5-7*{√2+[20√5-2√5+18√2:18]}=
=3√5-7*{√2+18√5+√2}=
=3√5-7*{2√2+18√5}=
=3√5-14√2-126√5=
=-123√5-14√2