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2
_ *0,25+78/4-8radical5/radical5-3*7radical2
5

Răspuns :

2/5·0,25+78/4-8√5/√5-3·7√2=
2/5·25/100+39/2-8-21√2=
1/10+39/2-8-21√2=
(1+39·5-8·10-21√2·10)/10=
(1+195-80-210√2)/10=(116-210√2)/10=2(58-105√2)/10=(58-105√2)/5

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