15.8*69.3-15.8*68.3如何用简便做?
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15.8*69.3-15.8*68.3如何用简便做?
15.8*69.3-15.8*68.3
=15.8*(69.3-68.3)
=15.8*1
=15.8
=15.8*(69.3-68.3)
=15.8*1
=15.8
15.8*69.3-15.8*68.3
=15.8*(69.3-68.3)
=15.8*1
=15.8
15.8*69.3-15.8*68.3
=15.8*(69.3-68.3)
=15.8*1
=15.8