7/9-0,4-4/15
с решение очень срочно
7/9-0,4-4/15=7/9-4/10-4/15=70/90-36/90-24/90=10/90=1/9
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7/9-0,4-4/15=7/9-4/10-4/15=70/90-36/90-24/90=10/90=1/9