\(\frac{1}{x.\left(x+1\right)}+\frac{1}{\left(x+1\right)\left(x+2\right)}+\frac{1}{\left(x+2\right)\left(x+3\right)}-\frac{1}{x}=\frac{1}{2010}\).
\(\frac{1}{x}-\frac{1}{x+1}+\frac{1}{x+1}-\frac{1}{x+2}+\frac{1}{x+2}-\frac{1}{x+3}+\frac{1}{x+3}-\frac{1}{x}=\frac{1}{2010}\)
\(=-\frac{1}{x+3}=\frac{1}{2010}\)
\(x=2010-\left(-3\right)=2013\)
Tính hợp lý ( nếu được )
a) 2/9 x 11/5 - 1/3 x 7/15 b) 3/7 x 9/16 - 1/14 x 1/8
c) -1/2010 - 1/2010 x 2009 - 1/2009 x 2008 - .... - 1/3 x 2 - 1/2 x1
tim x thuoc z biet
a,1/(1×2) + 1/(2×3) + ... + 2/(x(x+1)) = 2005/2010
1) Tim x, biet:
a) /2-x / =1/2
b) 3- / x +1/2 / = 1
c) / x - 1/2 / < 3
d) / x + 2 / > 1
tat ca deu la bai lien quan den gia tri tuyet doi nha may ban
giup mk nha
bai tim x
cau a |x-1/2 |=4
caub |x+3/4|-1/2=1
cau c 1/2+|x-4/3|=2
cau d |3x-1|+2=1
cau e |5/6+x|=3
bai 1: Tim x biet
\(\hept{\begin{cases}x-y=\frac{3}{10}\\y\left(x-y\right)=-\frac{3}{50}\end{cases}}\)
bai 2: Tim x, y biet:
x+\(\left(-\frac{31}{12}\right)^2\)=\(\left(\frac{49}{12}\right)^2\)-x=y2
Bai 9: Tim x,y,z biet:
(x-1)2+(x+y)2+(xy-z)2=0
ai giai minh bai toan tim x\(2^x+2^{x+1}+2^{x+2}+2^{x+3}=120\)
Bai 1:a)Tim x biet\(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+...+\frac{2}{x\times\left(x+1\right)}=\frac{2009}{2011}\)
b)\(\left(x-1\right)\times f\left(x\right)=\left(x+4\right)\times f\left(x\right)\)voi moi x
Bai 2;Tim x;y;z biet a)\(\frac{y+z+1}{x}=\frac{x+z+2}{y}=\frac{x+y-3}{z}\) b)\(\frac{2x+1}{5}=\frac{3y-z}{7}=\frac{2x+3y-1}{6x}\)
Bai 1
( 1/2 - 1 ) . (1/3- 1) . ( 1/4 - 1 )....( 1/2012 - 1 ) . ( 1/2013 - 1)
Bai 2 Tim tap hop cac so nguyen x thoa man cac dieu kien sau
a) 7/2 . 5/12 - 1 < x < 23/3 ÷ 7/3 + 5/7
b) -2240/6 x + 3 ÷ 5/3 la so nguyen
Bai 1 : Tinh gia tri cac bieu thuc
a) x2 + 10x + 26 vs x=45
b) x2 - 0,2x + 0,01 vs x= 1,1
Bai 2: Tim x
a) (2x - 5)2 - (4x - 1) . (x + 3) = 5
b) (3x + 4 )2 - (3x - 1) . (3x + 1)= 2
giup mk, mk tick cho !! camon m.n nhieu@@
