- 问题详情:Notallmathskillsarelearnedintheclassroom.Someofthemcomenaturally.Considerthesplit-secondcalculations youmakewhenyouestimate(估计)thenumberofemptyseatsontheschoolbusorthenumberofcookiesinacookiejar.Theseestimatescanoftenbedonewithoutcounting.That'...
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