(10*2 i dwie trzecie +7,5/10) * (3/40-7/30*0,25+157/360)
(10*2 i dwie trzecie +7,5/10) * (3/40-7/30*0,25+157/360)=
(20*2⅔+¾)*(9/120-7/120+157/360)=
(122/3+9/12)*(6+157/360)=
488+9/12 *163/360=
497/12*163/360= 12+ 1787/4320
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(10*2 i dwie trzecie +7,5/10) * (3/40-7/30*0,25+157/360)=
(20*2⅔+¾)*(9/120-7/120+157/360)=
(122/3+9/12)*(6+157/360)=
488+9/12 *163/360=
497/12*163/360= 12+ 1787/4320