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sh(x?y)?sh x?ch y?ch x?sh y的证明,
2222shchchsh
yyxxyyxx eeeeeeee
yxyx


44
)()( yxyxxyyxyxyxxyyx eeeeeeee

)(sh2
)(
yxee
yxyx


,
222shchchsh
yyxxyyxx eeeeeeee
yxyx

2222shchchsh
yyxxyyxx eeeeee
yxyx

2222shchchsh
yyxyyxx eeeeeeee
yxyx

222shchchsh
yyxxyyxx eeee
yxy


44
)()( yxyxxyyxyxyxxyyx eeeeeeee

)(sh2
)(
yxee
yxy


,