1) 1/2а+1/3а-1/4а=7/12а=7/12*12/7=1
2) решение в(4/7+5/21-2/3)=3/21в=1/7в=1/7*7/3=1/3
3) решение m(1 5/12+2 7/18-1 2/9)= m(17/12+43/18-11/9)=m*93/36=31/12*m=31/12*48/31=48/12=4
1) 1/2а+1/3а-1/4а=7/12а=7/12*12/7=1
2) решение в(4/7+5/21-2/3)=3/21в=1/7в=1/7*7/3=1/3
3) решение m(1 5/12+2 7/18-1 2/9)= m(17/12+43/18-11/9)=m*93/36=31/12*m=31/12*48/31=48/12=4