来自李志方的问题
12+22+32+…+20012+20022除以7的余数是______.
12+22+32+…+20012+20022 除以7的余数是______.
1回答
2020-05-30 06:38
12+22+32+…+20012+20022除以7的余数是______.
12+22+32+…+20012+20022 除以7的余数是______.
(12+22+32+…+20012+20022)÷7
=2002×(2002+1)×(2×2002+1)÷6
=2002×2003×4005÷6,
=16060074030÷6,
=2676679005,
答:12+22+32+…+20022除以7的余数是0.
故答案为:0.