Ответ:
4/5-x=25/30-13/20=50/60-39/60
4/5-x=11/60
x=4/5-11/60=48/60-11/60
x=37/60
(4/5-37/60)+13/20=25/30
(48/60-37/60)+13/20=11/60+39/60=50/60=25/30
25/30=25/30
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Ответ:
4/5-x=25/30-13/20=50/60-39/60
4/5-x=11/60
x=4/5-11/60=48/60-11/60
x=37/60
(4/5-37/60)+13/20=25/30
(48/60-37/60)+13/20=11/60+39/60=50/60=25/30
25/30=25/30