问题 填空题

237+238+239+240+241+242+243=______×______=______.

答案

237+238+239+240+241+242+243,

=(237+243)+(238+242)+(239+241)+240,

=240×2+240×2+240×2+240,

=240×(2+2+2+1),

=240×7,

=1680.

故答案为:240,7,1680.

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