Tinh 

A=1×2×3+2×3×4+3×4×5+...+98×99×100

B=1×3+2×4+3×5+4×6+...+49×51+48×50

100 mũ 2/100.1 +99 mũ 2 + 2 mũ 2/99.2 +98 mũ 2+3 mũ 3/98.3+....+52 mũ 2+49 mũ 2/52.49 + 51 mũ 2 +50 mũ 2 /50+51

tính A=1*99+2*98+3*97+...+49*51+50*50

Tính: \(B=\frac{100^2+1^2}{100\cdot1}+\frac{99^2+2^2}{99\cdot2}+\frac{98^2+3^2}{98\cdot3}+...+\frac{52^2+49^2}{52\cdot49}+\frac{51^2+50^2}{51\cdot50}\)

Tính :

D = 2 . 3 + 4 . 5 + 6 . 7 + ... + 50 . 51

E = 1 . 99 + 2 . 98 + 3 . 97 + ... + 49 . 51 + 50 . 50

giải bài toán theo cách hợp lý

(100 + 99 + 98 + ...+51) - (50 + 49 +...+2 + 1)

Tính:

a)1*4*7+4*7*10+7*10*13+....+100*103*106

b)1*4+4*7+7*10+.....+100*103

c)1*1*1+4*4*4+7*7*7+....+99*99*99

d)1*3*3*3+3*5*5*5+5*7*7*7+.....+49*51*51*51

e)1*99+2*98+3*97+......+50*50

f)1*99+3*97+5*95+....+49*51

Giúp mình nhé!

((100²+1²)/(100*1))+((99²+2²)/(99*2))+((98²+3²)/(98*3))+...+((51²+50²)/(51*50))

1/2+1/12+1/30+...+1/9120+1/9506+1/9900. / 50-50/51-51/52-...-97/98-98/99-99/100