Ответы и объяснения

2013-09-10T16:31:18+04:00
8,4*(7/9-1/3)+1/3*8,4=14/15
7/9-1/3=7/9-3/9=4/9
8,4*4/9=8 4/10*4/9=84/10*4/9=3 11/15
1/3*8,4=1/3*8 4/10=1/3*84/10=28/10=2 8/10=2 4/5
3 11/15-2 4/5=3 11/15-2 12/15=56/15-42/15=14/15