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				@@ -4,7 +4,7 @@ function Add(arg1, arg2) { 
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				     try { r1 = arg1.toString().split(".")[1].length } catch (e) { r1 = 0 } 
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				     try { r2 = arg2.toString().split(".")[1].length } catch (e) { r2 = 0 } 
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				     m = Math.pow(10, Math.max(r1, r2)) 
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				-    return (arg1 * m + arg2 * m) / m 
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				+    return ((arg1 * m + arg2 * m) / m).toFixed(2); 
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				 } 
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				 //修改之后的减法 
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				 function Minus(arg1, arg2) { 
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				@@ -22,7 +22,7 @@ function Multiply(arg1, arg2) { 
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				     var m = 0, s1 = arg1.toString(), s2 = arg2.toString(); 
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				     try { m += s1.split(".")[1].length } catch (e) { } 
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				     try { m += s2.split(".")[1].length } catch (e) { } 
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				-    return Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m) 
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				+    return (Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m)).toFixed(2); 
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				 } 
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				 //修改之后的除法 
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				 function Division(arg1, arg2) { 
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				@@ -32,6 +32,6 @@ function Division(arg1, arg2) { 
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				     with (Math) { 
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				         r1 = Number(arg1.toString().replace(".", "")) 
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				         r2 = Number(arg2.toString().replace(".", "")) 
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				-        return (r1 / r2) * pow(10, t2 - t1); 
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				+        return ((r1 / r2) * pow(10, t2 - t1)).toFixed(2); 
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				     } 
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				 } 
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