{"id":"fraction-calculator","engine":"core","category":"math","name":"Точные действия с дробями","fields":[{"key":"a","label":"a","type":"text","default":"2/3","required":true},{"key":"b","label":"b","type":"text","default":"3/4","required":true},{"key":"operation","label":"Операция","type":"select","default":"add","options":[{"value":"add","label":"Сложить"},{"value":"subtract","label":"Вычесть"},{"value":"multiply","label":"Умножить"},{"value":"divide","label":"Разделить"}]}],"sample":{"a":"2/3","b":"3/4","operation":"add"}}