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