X1=0.800X1+0.070X2+0.083X3 ----------(1)
X2=0.100X1+0.900X2+0.067X3 ----------(2)
X3=0.100X1+0.030X2+0.850X3 ----------(3)
X1+X2+X3=1.0---------------------------------(4)
有(4)式中得到X1=1— X2—X3
把X1=1— X2—X3代入(1)式中得到0.27 X2=0.2—0.283 X3-------(5)
(2)式—(3)式得到X3=0.599 1X2代入(5)
得到X2=0.454并代入(5)式中得到X3=0.273
将X2=0.45 X3=0.273 带入(4)中得到X1=0.273