(1+17+19)×(17+19+92)-(1+17+19+92)×(17+19)
=(1+17+19)×[(17+19)+92]-[(1+17+19)+92]×(17+19)
=[(1+17+19)×(17+19)+(1+17+19)×92]-[(1+17+19)×(17+19)+92×(17+19)]
=(1+17+19)×(17+19)-(1+17+19)×(17+19)+(1+17+19)×92-92×(17+19)
=(1+17+19)×92-92×(17+19)
=92+(17+19)×92-92×(17+19)
=92
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