242+243+244+245+246+247 =(_+_)X_ =_X_ =_

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242+243+244+245+246+247 =(_+_)X_ =_X_ =_
242+243+244+245+246+247 =(_+_)X_ =_X_ =_

242+243+244+245+246+247 =(_+_)X_ =_X_ =_
小学三年级数学题
242+243+244+245+246+247
=(242_+247_)X_3
=489_X_3
=_1467

242+249×3

(242+7)×3
=249×3
=747