（1＋0.228-0.21）x(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)x(0.228-0.21)

Let 0.228-0.21 be a and 0.228-0.21 + 0.2003 be B
（1＋a）x(b)-(1+b)x(a)
=b+ab-a-ab
=b-a
=0.2003

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