Tổng x bằng:
(-19) + (-18)+...+(-11)+ (-10) + (-9+9)+ (-8+8)+...+(-1+1)+0
= -[(19+10) x 10 :2] = -145
Tổng x bằng:
(-19) + (-18)+...+(-11)+ (-10) + (-9+9)+ (-8+8)+...+(-1+1)+0
= -[(19+10) x 10 :2] = -145
tinh tong tat ca cac so nguyen x thoa man -10<x<11
Tim cac so nguyen m,n,p thoa man p = m - n = m . n
Giup minh voi minh dang can gap
tinh tong tat ca cac so nguyen thoa man :
a) -20< x< 20
b) -15< x< 14
c) 12< x< 10
d) |x|< 5
1:tinh tong cua tat ca cac so nguyen x thoa man
|x|<6
a,tinh tong cua cac so nguyen x thoa man -2<x-2014 < 1
b,chung minh rang:\(\frac{10^{2014}+8}{72}\)
a,tinh tong cua cac so nguyen x thoa man-2<x-2014 < 1
b,chung minh rang:\(\frac{10^{2014}+8}{72}\)la mot so tu nhien
a,tinh tong cua cac so nguyen x thoa man -2<x-2014 < 1
b,chung minh rang\(\frac{10^{2014}+8}{72}\)la mot so tu nhien
tong cua tat ca cac so nguyen x thoa man \(-20\le x\le19\)
tim tong cua cac so nguyen x thoa man x^2<2016