đáp án là 91/243
k nha
Các câu hỏi tương tự
tính nhanh 1/4+1/12+1/36+1/108+1/324+1/972
Tính tổng: 1 + 1/4+ 1/12 + 1/36 + 1/108 +1/324 + 1/972
Tính tổng: 1/4 +1/12 + 1/36 + 1/108 + 1/324 + 1/972
Tính \(\frac{1}{4}+\frac{1}{12}+\frac{1}{36}+\frac{1}{108}+\frac{1}{324}+\frac{1}{972}\)
Tính B=\(\frac{1}{4}+\frac{1}{12}+\frac{1}{36}+\frac{1}{108}+\frac{1}{324}+\frac{1}{972}+\frac{1}{2916}+\frac{1}{8748}\)
1)Tính:
a) A=1/2+5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90
b) B=(3/4)(8/9)(15/16)(24/25)(35/36)(48/49)(63/64)
c) C=1/4+1/12+1/36+1/108+1/324+1/92
Tính :
a) A=1/2+1/22+1/23+......................................................+1/29
b) B=1/4+1/12+1/36+1/108+1/324+1/972
A=\(\frac{1}{4}+\frac{1}{12}+\frac{1}{36}+\frac{1}{108}+\frac{1}{324}+\frac{1}{972}\)
Tinh:
a) 1/2 + 1/2^2 + 1/3^2 +...+ 1/2^9
b) 1/4 + 1/12 + 1/36 + 1/108 + 1/324 + 1/972