1.先等式两边左乘A，等式左边|A|X(1/2A*)*=8X+A=>4X(1/2A*)*=8X+A

2.4X(1/2A*)*-8X=A

3.4x[(1/2A*)*-2E]=A

4.右乘1/2A*,4X[|1/2A*|E-1/2A*]=A(1/2A*)=>4X[|1/2A*|E-1/2A*]=2E

5.X=1/2[|1/2A*|E-1/2A*]-1.([|1/2A*|E-1/2A*]-1为[|1/2A*|E-1/2A*]的-1次幂)