(31-1)(-1/2x+5)=0
x-20/11-20/13.15-20/15.17-...........-22/53.55=3/11
tìm x nhé các bn
bn nào giúp mk sẽ tick cho 3 tick
yêu các bn nhìu
(31-1)(-1/2x+5)=0
x-20/11-20/13.15-20/15.17-...........-22/53.55=3/11
tìm x nhé các bn
bn nào giúp mk sẽ tick cho 3 tick
yêu các bn nhìu
a) \(\left(31-1\right)\left(\dfrac{-1}{2}x+5\right)=0\)
\(30\left(\dfrac{-1}{2}x+5\right)=0\)
\(\left(\dfrac{-1}{2}x+5\right)=0:30\)
\(\dfrac{-1}{2}x+5=0\)
\(\dfrac{-1}{2}x=0-5\)
\(\dfrac{-1}{2}x=-5\)
\(x=-5:\dfrac{-1}{2}\)
\(x=10\)
b) \(x-\dfrac{20}{11.13}-\dfrac{20}{13.15}-\dfrac{20}{15.17}-...-\dfrac{20}{53.55}=\dfrac{3}{11}\)
\(x-10\left(\dfrac{2}{11.13}+\dfrac{2}{13.15}+\dfrac{2}{15.17}+...+\dfrac{2}{53.55}\right)=\dfrac{3}{11}\)
\(x-10\left(\dfrac{1}{11}-\dfrac{1}{13}+\dfrac{1}{13}-\dfrac{1}{15}+\dfrac{1}{15}-\dfrac{1}{17}+...+\dfrac{1}{53}-\dfrac{1}{55}\right)=\dfrac{3}{11}\) \(x-10\left(\dfrac{1}{11}-\dfrac{1}{55}\right)=\dfrac{3}{11}\) \(x-10.\dfrac{4}{55}=\dfrac{3}{11}\) \(x-\dfrac{8}{11}=\dfrac{3}{11}\) \(x=\dfrac{3}{11}+\dfrac{8}{11}=1\)a) (31/20 - 26/45) . -36<x<(51/56+8/21+1/3)-8/13.
b)(2/11.13 + 2/13.15 + 2/15.17+...+2/53.55)- x + 22/2 - 1/31=4/3.
c)(x+5).(3x-12)>0
giúp mình vs nhé tick
tìm x
-2/3-1/3(2x-5)=3/2
(-x-1/2)3/4+1=1/3
(31-1)(-1/2+5)=0
x-20/11-20/13.15-20/15.17-...........-22/53.55=3/11
mk nhác tích lắm
bn nào giúp mk tick cho
a) -2/3 - 1/3.(2x-5)=3/2
1/3.(2x-5)= -2/3 - 3/2
1/3.(2x-5) = -13/6
2x-5 = -13/6 : 1/3
2x-5 = -13/2
2x = -13/2 + 5 = -3/2
x=-3/2 : 2 = -3/4
Xl pn nh mk chỉ có thể giúp pn câu a thôi
vì nó hơi dài mỏi tay lém nên mk xl nkoa
tìm số tự nhiên x : x-\(\frac{20}{11.13}-\frac{20}{13.15}-\frac{20}{15.17}-...-\frac{20}{53.55}=\frac{3}{11}\)
Giải chi tiết bạn nhé. Thanks nhìu. ai nhanh tui tik cho
giúp mình với!
x-20/11.13-20/13.15-20/15.17-...-20/53.55=3/11
=> x- (\(\frac{20}{11.13}\) + \(\frac{20}{13.15}\) +...+ \(\frac{20}{53.55}\)) = \(\frac{3}{11}\)
=> x - 10.(\(\frac{2}{11.13}\) + \(\frac{2}{13.15}\) +...+ \(\frac{2}{53.55}\)) = \(\frac{3}{11}\)
=> x - 10.( \(\frac{1}{11}\) - \(\frac{1}{13}\) + \(\frac{1}{13}\) - \(\frac{1}{15}\) +...+ \(\frac{1}{53}\) - \(\frac{1}{55}\)) = \(\frac{3}{11}\)
=> x - 10. (\(\frac{1}{11}\) - \(\frac{1}{55}\)) = \(\frac{3}{11}\)
=> x - 10.\(\frac{4}{55}\) = \(\frac{3}{11}\)
=> x - \(\frac{8}{11}\) = \(\frac{3}{11}\)=> x=1 Vậy x=1
tìm x là số tự nhiên , biết a, x-20/11.13-20/13.15-20/15.17-...-20/53.55=3/11
b, 1/21+1/28+1/36+...+2/x(x+1)=2/9
Làm ơn giúp mình , ai giúp mình mình tick cho
x-20\11.13-20\13.15-20\15.17-......-20\53.55=3\11
Tìm x :
\(\dfrac{0,2}{\left|2x-1\right|}-\dfrac{20}{11.13}-\dfrac{20}{13.15}-\dfrac{20}{15.17}-...-\dfrac{20}{53.55}=\dfrac{3}{11}\)
Tìm x biết: x-20/11.13-20/13.15-20/15.17-................-20/53.55=3/11
\(x-\dfrac{20}{11.13}-\dfrac{20}{23.15}-....-\dfrac{20}{53.55}=\dfrac{3}{11}\)
\(x-\left(\dfrac{20}{11.13}+\dfrac{20}{13.15}+....+\dfrac{20}{53.55}\right)=\dfrac{3}{11}\)
\(x-10\left(\dfrac{1}{11}-\dfrac{1}{13}+\dfrac{1}{13}-\dfrac{1}{15}+...+\dfrac{1}{53}-\dfrac{1}{55}\right)=\dfrac{3}{11}\)
\(x-10\left(\dfrac{1}{11}-\dfrac{1}{55}\right)=\dfrac{3}{11}\)
\(x-\dfrac{8}{11}=\dfrac{3}{11}\)
=> \(x=\dfrac{3}{11}+\dfrac{8}{11}=1\)
Ta có:
x-\(\frac{20}{11.13}\)-\(\frac{20}{13.15}\)-\(\frac{20}{15.17}\)-...-\(\frac{20}{53.57}\)=\(\frac{3}{11}\)
\(\Rightarrow\)\(\frac{20}{11.13}\)-\(\frac{20}{13.15}\)-\(\frac{20}{15.17}\)-...-\(\frac{20}{53.57}\)= x-\(\frac{3}{11}\)
\(\frac{1}{10}\).\((\frac{20}{11.13}.\frac{20}{13.15}.\frac{20}{15.17}...\frac{20}{53.57})\)= x-\(\frac{3}{11}\)
\(\frac{2}{11.13}\).\(\frac{2}{13.15}\).\(\frac{2}{15.17}\)...\(\frac{2}{53.57}\)= x-\(\frac{3}{11}\)
\(\frac{1}{11}-\frac{1}{13}+\frac{1}{13}-\frac{1}{15}+\frac{1}{15}\)-\(\frac{1}{17}\)+...+\(\frac{1}{53}\)-\(\frac{1}{57}\)=x-\(\frac{3}{11}\)
\(\frac{1}{11}-\frac{1}{57}\)=x-\(\frac{3}{11}\)
\(\frac{46}{627}\)=x-\(\frac{3}{11}\)
x=\(\frac{46}{627}\)-\(\frac{3}{11}\)
Vậy x=\(\frac{-125}{627}\)