Các câu hỏi tương tự
Tính nhanh:
a)A=7+9+...+97+99+102+108+...+504+510
b)B=1x2+2x3+...+99x100
tinh tong : 2\1*4+2\4*7+2\7*10+......+2\97*100
4+2/1007-4/2015+1/504-4/2017
1/288-7/2017+7/2014-7/2015+7
Tinh tong
P= 7+77+777+...+777...7 ( 15 chu so 7)
cac ban giup minh di minh dang can gap
tinh tong 5+7+9...+79+81
tinh tong S=2+7+12+...+2012
tinh tong 5+7+9..........................+79+81
khong thuc hien phep tinh , cho biet cac tong hoac hieu sau day la nguyen to hay hop so
32+3.17+3.433; 7+72+73+74+75 ; 46-30+2002 ; 3.4.5.6.7+7.8.9.10
cho P = 1 + 7 + 72 + 73 + ...+ 799
a ) tinh tong P
b ) chung to P chia het cho 7 du 1