问题
填空题
1+3+32+…+399被4除,所得的余数为________.
答案
0
1+3+32+…+399==
(3100-1)=
[(4-1)100-1]=
(4100-C1001499+…+C10098·42-C10099·4+1-1)=8(498-C1001497+…+C10098-25)
显然能被4整除,故余数为0.
1+3+32+…+399被4除,所得的余数为________.
0
1+3+32+…+399==
(3100-1)=
[(4-1)100-1]=
(4100-C1001499+…+C10098·42-C10099·4+1-1)=8(498-C1001497+…+C10098-25)
显然能被4整除,故余数为0.