用简便方法计算:19.98*37-199.8*1.9+1998*0.82
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用简便方法计算:19.98*37-199.8*1.9+1998*0.82用简便方法计算:19.98*37-199.8*1.9+1998*0.82用简便方法计算:19.98*37-199.8*1.9+1
用简便方法计算:19.98*37-199.8*1.9+1998*0.82
用简便方法计算:19.98*37-199.8*1.9+1998*0.82
用简便方法计算:19.98*37-199.8*1.9+1998*0.82
19.98*37-199.8*1.9+1998*0.82
=1998*0.37-1998*0.19+1998*0.82
=1998*(0.37-0.19+0.82)
=1998*1
=1998