问题标题：
0.397*0.00397*3600+6.3*3.97=?
问题描述：
0.397*0.00397*3600+6.3*3.97=?
李景州回答：
=0.397*0.397*36+6.3*3.97
=0.397*0.397*36+63*0.397
=0.397*(0.397*36+63)
=0.397*(0.397*9*4+7*9)
=0.397*9*(0.397*4+7)
=30.684924
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