\(\frac{x+9}{13-x}=\frac{6}{5}\)
\(\Rightarrow\orbr{\begin{cases}x+9=6\\13-x=5\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=-3\\x=8\end{cases}}\)
\(\frac{120-x}{30}=3\frac{1}{2}\)
\(\Rightarrow\frac{120-x}{30}=\frac{7}{2}\)
\(\Rightarrow\frac{120-x}{30}=\frac{105}{30}\)
\(\Rightarrow120-x=105\)
\(\Rightarrow x=120-105\)
\(\Rightarrow x=15\)
\(x+\frac{3+\frac{3}{20}+\frac{3}{13}+\frac{3}{2013}}{5+\frac{5}{20}+\frac{5}{13}+\frac{5}{2013}}=\frac{9}{2}\)
tìm x
Tìm x, biết: \(\frac{9+x}{13-x}=\frac{5}{6}\)
1,Tính nhanh
a,3x\(\left(\frac{1}{7}+\frac{1}{3}-\frac{3}{14}\right):\frac{11}{14}\)
b,\(\left(\frac{21}{8}+\frac{1}{2}\right):\frac{5}{6}\)
3,Tìm x,biết
a,\(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+......+\frac{2}{x\cdot\left(x+1\right)}=\frac{2016}{2018}\)
b,720:\(720:[41-\left(2\cdot x-5\right)]=120\)
Tính giá trị các biểu thức sau một cách nhanh nhất:
a) 0.2 x 517 x 7 x 0.7 x 483 x 2
b) \(\frac{4}{9}+\frac{6}{11}+\frac{5}{9}+\frac{16}{11}+7\)
c) \(\frac{3}{5}+\frac{5}{1}+\frac{7}{13}+\frac{2}{5}+\frac{16}{11}+\frac{19}{13}\)
\(\frac{5}{6}+\frac{1}{3}\cdot x=\frac{8}{9}b,120+x\cdot2=7\cdot x+45\)
Tìm x:
a) \(\frac{\left(34-x\right)}{30}\)= \(\frac{5}{6}\)
b) \(\frac{x+13}{34}\)= \(\frac{12}{17}\)
c) ( x + \(\frac{1}{3}\)) + ( x + \(\frac{1}{9}\)) + ( x + \(\frac{1}{27}\)) + ( x + \(\frac{1}{81}\)) = \(\frac{56}{81}\)
tìm x , biết :
a) 15 + 3 ( x - 1 ) = 36
b) \(\frac{2}{3}x+\left(1\frac{1}{9}\right)=\frac{23}{15}x\frac{5}{6}\)
tìm x:
a) \(x-\frac{5}{7}-\frac{13}{14}=1\) b) \(\frac{3}{5}+x+1\frac{1}{5}=\frac{11}{3}\) c) \(x.\frac{4}{5}:2=\frac{6}{7}\) d) \(\frac{6}{5}:x:\frac{5}{4}=\frac{10}{15}\)
Tìm x , biết :
\(\frac{2}{3}x+\left(1\frac{1}{9}\right)=\frac{23}{15}.\frac{5}{6}\)
