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\(\frac{1}{5.8}+\frac{1}{8.11}+...+\frac{1}{x.\left(x+3\right)}=\frac{101}{1540}\)
\(\Rightarrow\frac{3}{5.8}+\frac{3}{8.11}+...+\frac{3}{x.\left(x+3\right)}=\frac{303}{1540}\)
\(\frac{1}{5}-\frac{1}{8}+\frac{1}{8}-\frac{1}{11}+...+\frac{1}{x}-\frac{1}{x+3}=\frac{303}{1540}\)
\(\frac{1}{5}-\frac{1}{x+3}=\frac{303}{1540}\)
\(\frac{1}{x+3}=\frac{1}{5}-\frac{303}{1540}\)
\(\frac{1}{x+3}=\frac{1}{308}\)
\(\Rightarrow x+3=308\)
\(\Rightarrow x=308-3\)
\(x=305\)
Vậy \(x=305\)
Tham khảo nhé~
\(\frac{1}{3}\left(\frac{1}{5}-\frac{1}{8}+\frac{1}{8}-\frac{1}{11}+...+\frac{1}{x}-\frac{1}{x+3}\right)=\frac{101}{1540}\)
<=>\(\frac{1}{3}\left(\frac{1}{5}-\frac{1}{x+3}\right)=\frac{101}{1540}\)
<=> \(\frac{1}{5}-\frac{1}{x+3}=\frac{303}{1540}\)
<=>\(\frac{1}{x+3}=\frac{1}{308}\)
<=> x+3=308
<=> x=305
1.
a.= (-5/24+3/4+7/12): -9/4
=(-5/24+18/24+14/24) . -4/9
= 9/8 .-4/9=-1/2
b. =(3/5+83/200-3/200).8/3 .1/4
=(120/200+83/200-3/200) .2/3
=1.2/3=2/3
2.
a. 1/3(2x-5)=-2/3-3/2
1/3(2x-5)=-13/6
2x-5=-13/2
2x=-3/2
x=-3/2:2=-3/4
b. 1/3x-1/2x=3/4
x(1/3-1/2)=3/4
x.1/6=3/4
x=9/2
\(\Leftrightarrow2\left(\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{x\left(x+1\right)}\right)=\frac{2008}{2010}\)
\(\Leftrightarrow2\left(\frac{3-2}{2.3}+\frac{4-3}{3.4}+\frac{5-4}{4.5}+...+\frac{\left(x+1\right)-x}{x\left(x+1\right)}\right)=\frac{2008}{2010}\)
\(\Leftrightarrow2\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+...+\frac{1}{x}-\frac{1}{x+1}\right)=\frac{2008}{2010}\)
\(\Leftrightarrow\frac{1}{2}-\frac{1}{x+1}=\frac{1004}{2010}\)
\(\Leftrightarrow\frac{1}{x+1}=\frac{1}{2010}\)
\(\Leftrightarrow x+1=2010\)
\(\Leftrightarrow x=2009\)
-5/8 < x/16 <-1/2
Suy ra : -10/16 < x/16 < -8/16
Suy ra : -10<x<-8 . Suy ra x thuộc { -9 }
Vậy x = -9
k cho mik nha mọi người ! Thanks
\(\frac{-5}{8}< \frac{x}{16}< \frac{-1}{2}\)
\(\Rightarrow\frac{-10}{16}< \frac{x}{16}< \frac{-8}{16}\)
\(\Rightarrow-10< x< -8\)
mà \(x\inℤ\)
\(\Rightarrow x=-9\)
vậy \(x=-9\)
ta có: x^2 +( 2x)^2 + (3x)^2 + (4x)^2+(5x)^2=220
x^2 + 4x^2 + 9x^2 + 16x^2 + 25x^2 =220
55x^2 =220
x^2 =4
mà x> 0 suy ra x=2
nhớ bấm 3 đúng cho mình nhé!
bai nay khong phai la cua lop 5 dau ,cua lop 6 day!!! Nhung ma du sao ket qua cung bang 2
TL
\(\left(x-11\right)^2=25\)
\(\Rightarrow\orbr{\begin{cases}x-11=5\\x-11=-5\end{cases}\Leftrightarrow\orbr{\begin{cases}x=5+11\\x=-5+11\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=16\\x=6\end{cases}}}\)
HT
Th1 : ( x - 11 )2 = 52
x - 11 = 5
x = 5 + 11
x = 16
Th2 : ( x - 11)2 = (-5)2
x - 11 = -5
x = ( -5 ) + 11
x = 6
x - 11= 5
x = 5+11
x = 16 th2 ": (x - 11)^2= ( -5)^2
x-11= -5
x = ( -5)+11
x=6
x-11=5
x=5+11
x=16th2:(x-11)^2=(-5)^2
x-11=(-5)
x=6
? sory
X=16
X=6
HT
tham khảo
(x -11)2 = 25
-> \([\frac{x-11=5}{x-11=-5}\)\(\Leftrightarrow\)\([\frac{x=5+11}{x=-5+11}\)\(\Leftrightarrow[\frac{x=16}{x=6}\)
hok tốt nha
kết quả
x-11=5
x=11=5
X=16
x=16th2:(x-11)=(-5)2
x-11=(-5)
x=-5+11
x=6
kết quả
x-11=5
x=11=5
X=16
x=16th2:(x-11)=(-5)2
x-11=(-5)
x=-5+11
x=6
kết quả
x-11=5
x=11=5
X=16
x=16th2:(x-11)=(-5)2
x-11=(-5)
x=-5+11
x=6
k cho em nha anh
gtawtefat
Đủ 5 ng r, ai gửi nx ko t i c k đâu, CHỐT
cho tui ghi lại nhé vì tui vít thíu
x - 11 = 5
x = 5 + 11
x = 16 th 2 : ( x - 11 )2 = ( -5)2
x - 11 =-5
x = (-5) + 11
x = 6
?
x-11=5
x=5+11
x=16th2 : (x-11)2 =(-5)2
x-1=-5
x=(-5+11)2
x=6
đúng ko
x=5+11
x=16th2 : (x-11)2 =(-5)2
x-1=-5
x=(-5+11)2
x=6