(1/5+1/3)÷(3/5-1/15)+0,999...
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(1/5+1/3) : (3/5-1/15)+0,999...
1/5+1/3= 3/15+5/15= 8/15
3/5-1/15= 9/15-1/15= 8/15
8/15 : 8/15= 8/15 . 15/8= 120/120= 1
1+0,999...= 1,999...
1/5+1/3= 3/15+5/15= 8/15
3/5-1/15= 9/15-1/15= 8/15
8/15 : 8/15= 8/15 . 15/8= 120/120= 1
1+0,999...= 1,999...
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