Ответ:
1) 1-9/13= 13/13-9/13= 4/13
2) 4/13:13/20=4/13•20/13=80/169
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Ответ:
1) 1-9/13= 13/13-9/13= 4/13
2) 4/13:13/20=4/13•20/13=80/169