Today is Sunday, if tomorrow is the first day, then the 20033-20023 + 20013-20003 + -23 + 13 days is a week______ .

Today is Sunday, if tomorrow is the first day, then the 20033-20023 + 20013-20003 + -23 + 13 days is a week______ .

Because a3-b3 = (a-b) (A2 + AB + B2), then 20033-20023 + 20013-20003 + -23+13=(2003-2002)(20032+2003×2002+20022)+(2001-2000)(20012+2001×2000+20002)+… +(3-2)(32+3×2+22)+12=(20032+20022+20012+… +32+2...