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class Jiajianchengchu
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{
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public double jia(double c,double b)
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{
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return c+b;
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}
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public double jian(double b,double t)
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{
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return b-t;
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}
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public double cheng(double y,double u)
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{
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return y*u;
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}
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public double chu(double i,double k)
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{
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if(k!=0)
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return i/k;
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}
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}
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