Ответы и объяснения

2013-03-10T15:54:14+04:00

1/2 х+1/3х+1/4х=78

6/12х+4/12х+3/12х=78

13/12х=78

х=72

1/2х=36

1/3х=24

1/4х=18

36+24+18=78