\(A=\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+\frac{1}{81}+....+\frac{1}{6561}\)
\(\Rightarrow\)\(3A=1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+....+\frac{1}{2187}\)
\(\Rightarrow\)\(3A-A=\left(1+\frac{1}{3}+...+\frac{1}{2187}\right)-\left(\frac{1}{3}+\frac{1}{9}+....+\frac{1}{6561}\right)\)
\(\Rightarrow\)\(2A=1-\frac{1}{6561}=\frac{6560}{6561}\)
\(\Rightarrow\)\(A=\frac{3280}{6561}\)
☹➞cac ban giup minh cau nay voi
☛ tinh tong
M = 1+\(\dfrac{1}{5}\)+\(\dfrac{3}{35}\)+...\(\dfrac{3}{9603}\)+\(\dfrac{3}{9999}\)
➜giup minh nhanh nhe minh dang can gap lam moi nguoi a
➞thank you cac ban ❕
a)\(x-\frac{4}{5}=\frac{5}{7}\);b)\(5x=\frac{-1}{5}+\frac{11}{5}\); c)\(\frac{5}{3}-x=7+\frac{4}{5}\);d)\(\frac{-5}{11}+2x=\frac{7}{22}\)
CAC BAN GIUP MINH NHE MINH DANG CAN GAP
BAi 1
a) hay so sanh
\(\frac{2014}{2015}+\frac{2015}{2014}\)va \(\frac{666665}{333333}\)
b)tinh
A=\(\left(1-\frac{1}{28}\right)\left(1-\frac{1}{36}\right)\left(1-\frac{1}{45}\right)...\left(1-\frac{1}{1326}\right)\)
cac ban lam nhanh nhe minh dang can gap xong minh tick cho
\(A=1+\frac{1}{2}+\frac{1}{2^2} +\frac{1}{2^3}+...+\frac{1}{2^{2012}}\)
ghi loi giai day du nha may ban
ai ghi du loi giai va nhanh minh se tick(toan lop 6 nhe)
tìm x biết
a,\(|5x+\frac{3}{4}|-\frac{5}{4}=2\)
b,\(\frac{3}{2}-|\frac{1}{2}x+1|=\frac{1}{4}\)
cac ban lam on giup minh lam nhanh nhe
chung minh rang
\(1-\frac{1}{2}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{199}-\frac{1}{200}=\frac{1}{101}+\frac{1}{102}+\frac{1}{103}+...+\frac{1}{200}\)
giup minh minh like cho nho giai chi tiet mot chut nhe
\(\frac{X}{-5}=\frac{8}{10}\), \(\frac{20}{X}=\frac{-6}{30}\)
\(\frac{25}{-10}=\frac{X}{4}\)
Cac ban ghi cach giai cho minh nhe
Tim x:
a/ 3x - \(\frac{3}{2}\)- 5x+ \(\frac{10}{3}\) = 1
b/ |x-1|= 5-x
Cac ban mau giai ho minh nha! Mai minh nop bai roi
a,\(\left(\frac{-1}{2}\right)^3-\left(\frac{2}{5}x+\frac{1}{3}\right)=3\)
b,\(-2\frac{1}{3}-\left(4\frac{1}{6}-\frac{4}{3}+1\frac{1}{2}\right)\)
AI GIAI DUOC MINH CHO 10 TICK.NHANH NHA MINH DANG CAN GAP
