[{"question":"Vypo\u010d\u00edtajte: {8x-[-(2y+4y)+6x] }+4x","answers":["5x+6y","5x+5y","6x+6y","x+y"],"correct":"6x+6y","order":"1"},{"question":"Vypo\u010d\u00edtajte: -{-[-(3x+9y)+5x]+4y}-3x","answers":["13y+x"," -x+13y"," -x-13y"," -13x+y"],"correct":" -x-13y","order":"2"},{"question":"Vypo\u010d\u00edtajte: 9r-{-[-(2s+4r)+2s]-3r}","answers":["r","8r","r+s","s"],"correct":"8r","order":"3"},{"question":"Vypo\u010d\u00edtajte: 6a-{-[2b+3a-(3b-a)-2a]+ b}","answers":["a-b","a+b","8a-2b","8a+2b"],"correct":"8a-2b","order":"4"},{"question":"Vypo\u010d\u00edtajte: 3,5m-7,2n-(5,4m+1,8n)+3,7m-8,7n","answers":["n+m","0,1n+m","1,8m-17,7n","18m-1,7n"],"correct":"1,8m-17,7n","order":"5"},{"question":"Vypo\u010d\u00edtajte: (4x-4y):(x-y)","answers":["4x","4","x","1"],"correct":"4","order":"6"},{"question":"Vypo\u010d\u00edtajte: (77xy-1,21xz):1,1x","answers":["70x","70y-1,1z","x-1,1z","x-z"],"correct":"70y-1,1z","order":"7"},{"question":"Osobn\u00fd automobil ide r\u00fdchlos\u0165ou 90 km\/h. Ur\u010dte jeho r\u00fdchlos\u0165 v metroch za sekundu","answers":["900m\/s","25m\/s","3600m\/s","36m\/s"],"correct":"25m\/s","order":"8"},{"question":"Traktor \u0165ah\u00e1 pluh so \u0161tyrmi pluhov\u00fdmi telesami silou ve\u013ekosti 12000 N po dr\u00e1he 1000m v smere sily. Ak\u00fa ve\u013ek\u00fa pr\u00e1cu vykon\u00e1?","answers":["10 MJ","9 MJ","1200 MJ","12 MJ"],"correct":"12 MJ","order":"9"},{"question":"Vypo\u010d\u00edtajte: 3x-(3+3x)-[-(-3x+3) ]","answers":["3","x","3x","3x-3"],"correct":"3x","order":"10"}]