示例#1
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 public override TermBase Raise(TermBase power) => power switch
 {
示例#2
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 public override TermBase Div(TermBase b) => b switch
 {
示例#3
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 public override TermBase Div(TermBase b) => b is TermZero _ ? throw new DivideByZeroException($"{this}/{b}") : new TermZero();
示例#4
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 public override bool Equals(TermBase other) => other is TermZero;
示例#5
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 public override TermBase Mult(TermBase b) => new TermZero();