156+78x1983+22x1985
=156+78x1983+22x(1983+2)
=156+78x1983+22x1983+22x2
=156+(78+22)x1983+44
=156+44+100x1983
=200+198300
=198500
或者
=156+78x(1985-2)+22x1985
=156+78x1985-78x2+22x1985
=156-156+(78+22)x1985
=0+100x1985
=198500
156+78×1983+22×1985
=156+78×(1985-2)+(100-78)×1985
=156+78×1985-78×2+100×1985-78×1985
=156-78×2+78×1985-78×1985+100×1985
=198500