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Calculați: a) √0,0225- 0,(6)•√1,125•2+0,2(7)•√0,09

Răspuns :

√225 / √10000 - 6/9 *√1125/√1000  * √2/1 + (27-2)/90* √9/√100=
15/100 -6/9 *√9/√8*√2/1 +25/90*3/10=
3/20-2/3*3/√4+25/(30*10)=
3/20 - 2/2 +25/300=
3/20-2/2 +1/12=
9/60 - 60/60 + 5/60=
(14-60)/60=
-46/60
=-23/30