1,25+(-1 1/4)= 1,25-1,25= 0
1 1/28= 29/28, обратное 28/29
0+28/29= 28/29
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1,25+(-1 1/4)= 1,25-1,25= 0
1 1/28= 29/28, обратное 28/29
0+28/29= 28/29