128x32一32十33x71怎么简便计算？

128x32一32十33x71
=128X32-32X1+(32+1)X71
=128X32-32X1+32X71+1X71
=(128-1+71)x32+71
=(127+71)x32+71
=198x32+71
=(200-2)x32+71
=200x32-2x32+71
=6400-64+71
=6400+7
=6407

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