Bài 1: Tìm x biết \(\frac{5^{x+2}+5^{x+1}+5^x}{31}=\frac{9^{2x}+9^{2x+1}+9^{2\left(x+1\right)}}{91}\)
Tìm x biết:
\(\frac{x+1}{x-2}=\frac{x+2}{x-9}\)
Tìm x,y,z biết
\(\frac{1-x}{4}=\frac{-9}{x-1}\)
Tìm x biết /x+\(\frac{7}{9}\)/+/x+\(\frac{1}{3}\)/+/x+2\(\frac{8}{9}\)/=5x
Tìm x; y biết:
a,\(\left|x\right|+3\sqrt{x^2+9}+x^{2010}=9\)9
b, \(\frac{1+3y}{12}=\frac{1+5y}{5x}+\frac{1+7y}{4x}\)
Tìm x biết: \(\frac{x+1}{9}+\frac{x+4}{6}+\frac{x+5}{5}=\frac{x+2}{8}+\frac{x+3}{7}+\frac{x+6}{4}.\)
Tìm x biết:
\(\frac{x-4}{9}=\frac{1}{x+5}\)
Tìm x, biết :
a) \(\frac{x-1}{27}=\frac{-3}{1-x}\)
b) \(\left(2\frac{1}{9}-\frac{15}{2135}:\frac{9}{4270}\right):x=\frac{222}{333}.\frac{2121}{4040}:\frac{132132}{660660}\)
Bài 2
a) Tìm x biết\(\frac{1}{2}-\left|\frac{5}{4}-2x\right|=\frac{1}{3}\)
b) Tìm x biết \(\frac{x+1}{10}+\frac{x+1}{11}+\frac{x+1}{12}=\frac{x+1}{13}+\frac{x+1}{14}\)
c) Tìm ba số x, y, z thỏa mãn: \(\frac{x}{y}=\frac{10}{9};\frac{y}{z}=\frac{3}{4}\)và \(x-y+z=78\)
Tìm x biết : \(\frac{1+y}{9}=\frac{1+2y}{7}=\frac{1+3y}{x}\). Vậy x = ?