\(S=1:3+1:15+1:35+...+1:9999\)
\(S=\frac{1}{3}+\frac{1}{15}+\frac{1}{35}+...+\frac{1}{9999}\)
\(S=2\left(\frac{1}{1.3}+\frac{1}{3.5}+\frac{1}{5.7}+...+\frac{1}{99.101}\right)\)
\(2S=1-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+...+\frac{1}{99}-\frac{1}{101}\)
\(2S=1-\frac{1}{101}\)
\(2S=\frac{100}{101}\)
\(S=\frac{100}{101}:2\)
\(S=\frac{50}{101}\)
Tinh tổng:(1-1/3)+(1-1/15)+(1-1/35)+.........+(1-1/9999)
1/3x1/15×1/35....1/9999
a/ 1/2 + 5/6 + 11/12 + 19/20
b/ 1/2 + 5/6 + 11/12 + 19/20 + 29/30 + 41/42
c/ (1-1/3) + (1-1/15) + (1-1/35) + (1-1/63)
d/ 1/2 + 5/6 + 11/12 + ... + 9899/9900
e/ 2/3 + 14/15 + 34/35 +62/63
f/ 2/3 + 14/15 + 34/35 + ... + 9998/9999
tính nhanh
C=1-(2/3+2/15+2/35+...+2/9999)
TÍNH:
\(\frac{1}{3}+\frac{1}{15}+\frac{1}{35}+...+\frac{1}{9999}\)
GIÚP MÌNH VỚI, MIK SẼ TICK CHO!!!
Tính hợp lí:
2/5×8+2/8×11+....+2/95×98+2/98×1011/3×1/15×1/35×...×1/99992^2/1×3×3^2/2×4×4^2/3×5×...×99^2/98×100tính
1/3+13/15+33/35+61/63+...+9601/9603+9997/9999
tl nhanh jup mik, đag cần gấp
M=1+1/5+3/35+...+3/9603+3/9999