1) 3.9-5.8=-1.9
2)1/45-7/9=1/45-35/45=-34/45
3)-1.9/10-(-34/45)=-19/10+34/45=
=-171/90+68/90=-103/90
4)-103/90+1,1/10=-103/90+99/90=-4/90=-2/45
Ответ:-2/45
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1) 3.9-5.8=-1.9
2)1/45-7/9=1/45-35/45=-34/45
3)-1.9/10-(-34/45)=-19/10+34/45=
=-171/90+68/90=-103/90
4)-103/90+1,1/10=-103/90+99/90=-4/90=-2/45
Ответ:-2/45