15=(15), (-15)
56=(56), (-56)
90=(90), (-90)
0=(0)
67=(67), (-67)
()- модуль
1) CD=1/2MN, CD=3/2, CD=1 1/2
2)CD=1/3MN, CD=3/3, CD=1
3) CD=3/2MN, CD=6/2=3
4) CD=3/5MN, CD=9/5=1 4/5
5) CD=4/3MN, CD=4
6) CD=5/3MN, CD=15/3=5
Х+1\4х+0.75х=1
1х+0.25х+0.75х=1
2х=1
х=1\2
х=0,5