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当x=5时,(x2-x)-(x2-2x+1)等于(  )

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Y2必须得电  X4必须得电  Y5和X15都要得电  只需X5闭合  
I(1)>I(2)=I(3)>I(4)=I(5)  I(1)>I(2)<I(3)>I(4)=I(5)  I(1)>I(2)>I(3)<I(4)=I(5)  I(3)>I(2)<I(1)>I(4)=I(5)  
(X1+X2+X3)-(X4+X5+X6)  X1-X4  X3-X6  (X3-X1)-(X6-X4)  
x2·x3=x6   (x2)3=x8   x2+x3=x5   x6÷x3=x3  
8%x6%x5%x7%  (8%x6%x5%x7%)-100%  108%x106%x105%x107%  (108%x106%x105%x107%)-100%  
(X1+X2+X3)-(X4+X5+X6)  X1-X4  X3-X6  (X3-X1)-(X6-X4)  
发生、不发生  不发生、发生  不一定、发生  可能发生、发生  
Y1=0.4636X1-0.2411X2+0.6126X3-0.3821X4-0.4535X5  Y1=2.8562X1+0.8090X2+0.5401X3+0.4516X4+0.343X5  Y1=0.4636X1+0.4571X2+0.47X3+0.4217X4+0.4213X5  Y1=0.8635X1+0.8236X2+0.7469X3+0.8882X4+0.8832X5  

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