计算:31.75*1又4/7+10.5*13又6/7--21.25*1又4/7--10又1/2*12又6/7
2014-05-21
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31.75*1又4/7+10.5*13又6/7--21.25*1又4/7--10又1/2*12又6/7
=31.75*11/7+10.5*97/7-21.25*11/7-10.5*90/7
=(31.75-21.25)*11/7+(97-90)*10.5/7
=10.5*11/7+7*10.5/7
=18*10.5/7
=18*1.5
=27
=31.75*11/7+10.5*97/7-21.25*11/7-10.5*90/7
=(31.75-21.25)*11/7+(97-90)*10.5/7
=10.5*11/7+7*10.5/7
=18*10.5/7
=18*1.5
=27
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