2)=20/21+5/7=20/21+15/21=35/21=1 14/21
|-3,5|-|2,6|= 0,9
|20/21|+|-5/7|=35/21=одна целая 14/21=одна целая 2/3
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2)=20/21+5/7=20/21+15/21=35/21=1 14/21
|-3,5|-|2,6|= 0,9
|20/21|+|-5/7|=35/21=одна целая 14/21=одна целая 2/3