4.57-1.57➗4✖️2.5简便运算
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4.57-1.57➗4✖️2.5
=4.57-1.57✖️2.5/4
=4.57-1.57✖️10/16
=4.57-15.7/16
=4+57/100-157/160
=4+(57*8-157*5)/800
=4+(57*8-57*5-500)/800
=4+(57*3-500)/800
=4+(171-500)/800
=4+(-329)/800
=3+(800-329)/800
=3又471/800
=4.57-1.57✖️2.5/4
=4.57-1.57✖️10/16
=4.57-15.7/16
=4+57/100-157/160
=4+(57*8-157*5)/800
=4+(57*8-57*5-500)/800
=4+(57*3-500)/800
=4+(171-500)/800
=4+(-329)/800
=3+(800-329)/800
=3又471/800
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