设1+0.228-0.21=x 0.228-0.21=y
原式=x*(y+0.2003)-(x+0.2003)*y
=xy+0.2003x-xy-0.2003y
=0.2003x-0.2003y
=0.2003*(x-y)
=0.2003*1
=0.2003
（1+0.228-0.21）×（0.228-0.21+0.2003）-（1+0.228-0.21+0.2003）×（0.
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