решите уравнение : 1) 12/13-(х+5/13)=6/13; 2) ( 31/39-х)+2/39=10/39.

1)12/13-(х+5/13)=6/13х+5/13=12/13-6/13=6/13х=6/13-5/13х=1/13ответ: х=1/132)(31/39-х)+2/39=10/3931/39-х=10/39-2/39=8/39х=31/39-8/39=23/39ответ:х=23/39

х+ 5/13=12/13-6/13х+5.13=6.13х=6.13-5.13х=1.1331.39-х=10.39-2.3931.39-х=8.39х=31.39:8.39х=3. 7/8