前后出入一塊錢左右正常吧

總電量964        總費用735                     總電量966              總費用735    
都是三階+0.3元                            
X白天                            
Y晚上    
                        
X*0.8583+Y*0.6583=735                               X*0.8583+Y*0.6583=735            
X+Y=964                                                        X+Y=966            
                            
X=964-Y                                                        X=966-Y            
（964-Y）*0.8583+Y*0.6583=735                （966-Y）*0.8583+Y*0.6583=735            
964*0.8583-0.8583*Y+0.6583*Y=735            966*0.8583-0.8583*Y+0.6583*Y=735            
827.4012-(0.8583-0.6583)*Y=735                829.1178-(0.8583-0.6583)*Y=735            
827.4012-0.2*Y=735                                829.1178-0.2*Y=735            
0.2Y=827.4012-735                                0.2Y=829.1178-735            
0.2Y=92.4012                                                0.2Y=94.1178            
Y=92.4012/0.2                                        Y=94.1178/0.2            
Y=462.006                                                Y=470.589            
                            
X=964-462.006                                        X=966-470.589            
X=501.994                                                X=495.411            

不知道算的對不對，大差不差就行了，有四舍五入，上月結轉，有一點點出入都正常。                    
    

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