Ответ:
1. 5/12-9/10=7/10; 6.3/10-11/15=1.9/10; 5.7/8-9/10=2.39/40;7.5/12-3.2/9=5.1/3
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Ответ:
1. 5/12-9/10=7/10; 6.3/10-11/15=1.9/10; 5.7/8-9/10=2.39/40;7.5/12-3.2/9=5.1/3