X2=X1+X3-204=10X1+8X2-176=-40X3-8X2求X1 X2 X3

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X2=X1+X3-204=10X1+8X2-176=-40X3-8X2求X1 X2 X3
X2=X1+X3
-204=10X1+8X2
-176=-40X3-8X2
求X1 X2 X3

X2=X1+X3-204=10X1+8X2-176=-40X3-8X2求X1 X2 X3
X2=X1+X3 (1)
-204=10X1+8X2 (2)
-176=-40X3-8X2 (3)
把(1)带入(2)得
-204=10X1+8X1+8X3
-204=18X1+8X3 (4)
把(1)带入(3)得
-176=-40X3-8X1-8X3
-176=-8X1-48X3 (5)
(4)*6+(5)得
-204*6 +(-176)=(18*6-8)X1
-1400=100X1
X1=-14
X2=-8
X3=6

这个属于三元一次方程,应该用行列式来解,就很简单了

-14,-8,6

X2=X1+X3
-204=10X1+8X2
-176=-40X3-8X2
求X1 X2 X3
用三元一次方程组可解

X2=X1+X3
-204=10X1+8X2
-176=-40X3-8X2
-380=10x1-40x3
X2=X1+X3
-204*4=4*10X1+4*8X2
-176=-40X3-8X2
-640=40x1+40x3+40x2
x2=-8,x3=6,x1=-14

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