Ответ:29/39*(1/2+7/12)-8/9:10/21=-1 11/180
1/2+7/12=(1*6+7)/12=13/12
8/9:10/21=(8*21)/9*10=28/15
29/39*13/12=29/36
29/36-28/15=(29*5-28*12)/180=-191/180=-1 11/180
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Ответ:29/39*(1/2+7/12)-8/9:10/21=-1 11/180
1/2+7/12=(1*6+7)/12=13/12
8/9:10/21=(8*21)/9*10=28/15
29/39*13/12=29/36
29/36-28/15=(29*5-28*12)/180=-191/180=-1 11/180