Răspunsuri

2014-06-10T18:43:56+03:00
20 * ( 1/40 +8/1) -1

20 * (1/40 +8 ) -1   aducem la acelasi numitor in paranteza

20* (1-320)/40 -1

 -319/2 -1    aducem la acelasi numitor

(-319-2)/2=  -321/2=  -160,5