简便方法计算:1880*199.9-1999*187.9= 6.42*1.01/6.42= 12.5*8.8=快,急.
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简便方法计算:1880*199.9-1999*187.9= 6.42*1.01/6.42= 12.5*8.8=快,急.
简便方法计算:1880*199.9-1999*187.9= 6.42*1.01/6.42= 12.5*8.8=
快,急.
简便方法计算:1880*199.9-1999*187.9= 6.42*1.01/6.42= 12.5*8.8=快,急.
1880*199.9-1999*187.9
=188*1999-1999*187.9
=(188-187.9)*1999
=0.1*1999
=199.9
6.42*1.01/6.42
=6.42/6.42*1.01
=1*1.01
=1.01
12.5*8.8
=12.5*8*1.1
=100*1.1
=110