Các số nguyên thỏa mãn \(\text{-}20\le x\le19\)là: -20; -19; -18;.....; 17;18;19.
Tổng: (-20)+(-19)+...+18+19
= (-20) +[ (-19)+19]+[(-18)+18]+....+[(-1)+1] + 0
= (-20)+ 0+0+0+...+0
= -20
Tim tong cua tat ca cac so nguyen x thoa man -5 <x> 4
1:tinh tong cua tat ca cac so nguyen x thoa man
|x|<6
tong tat ca cac so nguyen x thoa man:(x+6)(x-9)=0
tong tat ca cac so nguyen x thoa man -2016<=x<=2016
tinh tong tat ca cac so nguyen x thoa man -10<x<11
tim tong tat ca cac so nguyen x thoa man
|x| <4
|x| khong vuot qua 5
tinh tong tat ca cac so nguyen thoa man :
a) -20< x< 20
b) -15< x< 14
c) 12< x< 10
d) |x|< 5
bai 1 tim tong cua tat ca cac so nguyen x thoa man
a)-5<x<8
b)-<x<12
c)-287+499+(-499)+285
d)(-135)+48+140+(-5)
ca trinh bay nha
tap hop tat ca cac so nguyen x thoa man ( 2- x ).(x+7) = 0