怎样简便怎样算99*72+78
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怎样简便怎样算99*72+78
99*72+78
=(99+1)*72+(78-72)
=7200+6
=7206
100*72-72+78
99*72+78
=(100-1)*72+78
=100*72-72*1+78
=7200-72+78
=7128+78=7206
怎样简便怎样算99*72+78
99*72+78
=(99+1)*72+(78-72)
=7200+6
=7206
100*72-72+78
99*72+78
=(100-1)*72+78
=100*72-72*1+78
=7200-72+78
=7128+78=7206