C1: (x-1).4=3.2
=> (x-1).4=6
=> x-1 =6/4
=> x-1 =1,5
C2: 2(x-1)/4 = 3/4
=> 2(x-1) = 3
=> 2x-2 =3
=> 2x =3+2
=> 2x =5
=> x =2,5
C1: (x-1).4=3.2
=> (x-1).4=6
=> x-1 =6/4
=> x-1 =1,5
C2: 2(x-1)/4 = 3/4
=> 2(x-1) = 3
=> 2x-2 =3
=> 2x =3+2
=> 2x =5
=> x =2,5
Tim x
\(\frac{x+2015}{5}+\frac{x+2016}{4}=\frac{x+2017}{3}+\frac{x+2018}{2}\)
2/ tim x
\(\frac{x+2015}{5}+\frac{x+2016}{6}=\frac{x+2017}{7} +\frac{x+2018}{8}\)
3/ tim x
\(\frac{1}{3}+\frac{1}{6}+\frac{99}{101}+\frac{1}{15}+... +\frac{1}{x\left(2x+1\right)}=\frac{1}{10}\)
tim x
\(\frac{1\frac{1}{2}}{3\frac{1}{2}}=\frac{x}{4}\)
1) Tìm số tự nhiên x nhỏ nhất đê \(3^{2014}+3^x\)chia het cho 10
2) tìm \(\frac{x}{y}biet\frac{4x}{6y}=\frac{2x+8}{3y+11}\)
3) tìm X biết\(\frac{4}{3.7}+\frac{4}{7.11}+\frac{4}{11.15}+.........+\frac{4}{\left(3X-1\right)\left(3X+3\right)}=\frac{3}{10}\)
4) Tam giácABC có goca=90 độ BC=30cm AB :AC= 3 :4 tim AB= .......cm
5) Tam giác ABC góc a=90 đường caoAH ;BH=9 cm ;CH=16cm Tim AH
6) Tìm số tự nhiên x ;y biết \(2^{x+1}.3^y=36^x\)
\(\frac{x-1}{2009}+\frac{x-2}{2008}=\frac{x-3}{2007}+\frac{x-4}{2006}\)tim x
tim x biết \(\frac{x-1}{x+2}=\frac{x-2}{x+3}\)
tim x \(\frac{x+4}{2000}+\frac{x+3}{2001}=\frac{x+2}{2002}+\frac{x+1}{2003}\)
Tim x\(\left|\frac{1}{2}-\frac{1}{3}+x\right|=-\frac{1}{4}-\left|y\right|\)
Tim x biết
\(\frac{3}{x-2}\)=\(\frac{-2}{\frac{1}{8}}\)
tim x
a)\(2\frac{3}{4}x-1\frac{5}{8}x=1\)
b)\(2\frac{3}{4}x-1\frac{5}{8}x=1\)
c)\(\frac{3}{2}x-\frac{2}{5}=\frac{1}{3}x-\frac{1}{4}\)
d)\(2x-\frac{1}{4}=\frac{5}{6}-\frac{1}{2}x\)
e)\(\frac{-5}{6}+3x=\frac{2}{3}-\frac{1}{2}x\)
f)\(\frac{5}{2}x-\frac{3}{2}=x+\frac{29}{10}\)
g)\(\frac{2}{3}+\frac{7}{3}x=\frac{5}{4}x+\frac{1}{6}\)
h)\(\frac{1}{3}.x+\frac{2}{5}\left(x-1\right)=0\)
giup mk nha moi nguoi