Ответы и объяснения

2012-09-04T18:42:10+00:00

-0,5*(-22,6/12)-1=(0,5*22,6)/12-1=11,3/12-1=(11,3-1*12)/12=-0,7/12=-7/120

2012-09-04T18:42:28+00:00

-1/2*(-4/5 - 13/12) - 1 = -1/2 * (-48/60 - 52/60) - 1 = -1/2 * (-100/60) - 1 = 
= 50/60 - 1 = 5/6 - 6/6 = -1/6