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(18.6-18.6*0.31)/0.69简算
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(18.6-18.6*0.31)/0.69 简算
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(18.6-18.6*0.31)/0.69
= 18.6*(1- 0.31)/0.69
= 18.6* 0.69/0.69
=18.6
= 18.6*(1- 0.31)/0.69
= 18.6* 0.69/0.69
=18.6
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