function accp(arg1,arg2){
 var t1=0,t2=0,r1,r2;
 try{t1=arg1.toString().split(".")[1].length}catch(e){}
 try{t2=arg2.toString().split(".")[1].length}catch(e){}
 with(Math){
 r1=Number(arg1.toString().replace(".",""));
 r2=Number(arg2.toString().replace(".",""));
 return (r1/r2)*pow(10,t2-t1);
 }
}

function accMul(arg1,arg2)
{
 var m=0,s1=arg1.toString(),s2=arg2.toString();
 try{m+=s1.split(".")[1].length}catch(e){}
 try{m+=s2.split(".")[1].length}catch(e){}
 return Number(s1.replace(".",""))*Number(s2.replace(".",""))/Math.pow(10,m);
}

Number.prototype.mul = function (arg){
 return accMul(arg, this);
};

function accAdd(arg1,arg2){
 var r1,r2,m;
 try{r1=arg1.toString().split(".")[1].length}catch(e){r1=0}
 try{r2=arg2.toString().split(".")[1].length}catch(e){r2=0}
 m=Math.pow(10,Math.max(r1,r2));
 return (arg1*m+arg2*m)/m;
}

//給Number類型增加一個add方法，調用起來更加方便。
Number.prototype.add = function (arg){
 return accAdd(arg,this);
}
//減法函數
function accSub(arg1,arg2){
 var r1,r2,m,n;
 try{r1=arg1.toString().split(".")[1].length}catch(e){r1=0}
 try{r2=arg2.toString().split(".")[1].length}catch(e){r2=0}
 m=Math.pow(10,Math.max(r1,r2));
 //last modify by deeka
 //動態控制精度長度
 n=(r1>=r2)?r1:r2;
 return ((arg2*m-arg1*m)/m).toFixed(n);
}
///給number類增加一個sub方法，調用起來更加方便
Number.prototype.sub = function (arg){
 return accSub(arg,this);
}