示例#1
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 public Rat QuotRat(Rat r) => new Rat(this.num * r.den, this.den * r.num);
示例#2
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 public Rat SubRat(Rat r) => new Rat(this.num * r.den - r.num * this.den, this.den * r.den);
示例#3
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 public Rat MultRat(Rat r) => new Rat(this.num * r.num, this.den * r.den);
示例#4
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 public Rat SumRat(Rat r) => new Rat(this.num * r.den + r.num * this.den, this.den * r.den);