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计算: 3x(x-1)=x(x+5)

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0.717、0.847、3.11、0.42和0.998  0.847、0.717、3.11、0.42和0.998  3.11、0.717、0.847、0.42和0.998  0.42、0.717、0.847、3.11和0.998  
-1/3X4-1/3X5<=2/3  X4-X5<=-2  X4+X5+S=2  -1/3X4-1/3X5+S=-2/3  
(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  
(X1+X2+X3)-(X4+X5+X6)  X1-X4  X3-X6  (X3-X1)-(X6-X4)  
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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