Biet 1^2+2^2+3^2+..+10^2=385
Hay tinh tong cua S=100^+200^2+300^2+..+1000^2
lam co loi giai nhe
tinh tong sau = 2 cach s= 1+ (-2) +3 +(-4) + ......+(-98) + 99
bai1.Tinh tong cua cac so nguyen am tu -1738 den -16
bai2.Tinh tong sau bang 2 cach
A=1+(-2)+3+(-4)+....+99+(-100)
bai1:tinh tong S=1.3+3.5+5.7+...+99.101
bai2 :tinh tong S=1.4+4.7+7.10+...+2017.2020
bai 3: tinh tong N=2.4+4.6+6.8+..+100.102
bai 4: tinh tóng=2.6+6.10+10.14+14.18+...+42.46+50.54
bai 5:tinh tongB=2^2+4^2+6^2+...+100^2
bai 6:C=1^2+3^2+...+100^2
bai7: biet 1^2+2^2+3^2+...+10^2=385 tinh tong 2^2+4^2+6^2+...+20^2
bai 8: tinh tong s=1^2+2^2+3^2+...+99^2
tinh tong sau bang cach hop ly
a = 2+2^2+2^3+2^4+...+2^100
mong moi nguoi giup do
tinh tong sau bang hai cach:
S= 1+[-2]+3+[-4]+...+[-98]+99
Tinh tong sau bang cach hop li nhat: (1+3+5+...+99)-(2+4+6+...+100)
S= 2+2^2+2^3+.....+2^2018
tinh tong , giai chi tiet
ai giai truoc minh tick cho nhe
Tinh tong S = 1×2+2×3+3×4+4×5+•••••+99×100
