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a/ \(78-5.|x-1|=-35+43.\)
\(78-5.|x-1|=8\)
\(5.|x-1|=78-8\)
\(5.|x-1|=70\)
\(|x-1|=70:5\)
\(|x-1|=14\)
\(\orbr{\begin{cases}x-1=14\\x-1=-14\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}x=15\\x=-13\end{cases}}\)Vậy :.....
b/ \(\left(3.|x|-2^4\right).7^3=2.7^4\)
\(\left(3.|x|-2^4\right)=2.7^4:7^3\)
\(3.|x|-2^4=2.7=14\)
\(3.|x|=14+2^4=14+16=30\)
\(|x|=30:3=10\)
\(\orbr{\begin{cases}x=10\\x=-10\end{cases}}\)Vậy : .....
Nhớ k cho mình nhé! Thank you!!!
\(\left(4\frac{1}{2}-\frac{2}{5}x\right):\frac{7}{4}=\frac{11}{14}\)
\(\left(\frac{9}{2}-\frac{2}{5}x\right)=\frac{11}{14}.\frac{7}{4}=\frac{11}{8}\)
\(\frac{2}{5}x=\frac{9}{2}-\frac{11}{8}\)
\(\frac{2}{5}x=\frac{25}{8}\)
\(x=\frac{25}{8}.\frac{5}{2}=\frac{125}{16}\)
\(\left(4\frac{1}{2}-\frac{2}{5}x\right):\frac{7}{4}=\frac{11}{14}\)
\(\left(\frac{9}{2}-\frac{2}{5}x\right)=\frac{11}{14}x\frac{7}{4}\)
\(\left(\frac{9}{2}-\frac{2}{5}x\right)=\frac{11}{8}\)
\(\frac{2}{5}x=\frac{9}{12}-\frac{11}{8}\)
\(\frac{2}{5}x=\frac{-5}{8}\)
\(x=\frac{-5}{8}:\frac{2}{5}\)
\(x=\frac{-25}{16}\)
a) (x + 1)2 = 4/3. 75/9
=> (x + 1)2 = 100/9
=> (x + 1)2 = (10/3)2
=> \(\orbr{\begin{cases}x+1=\frac{10}{3}\\x+1=-\frac{10}{3}\end{cases}}\)
=> \(\orbr{\begin{cases}x=\frac{7}{3}\\x=-\frac{13}{3}\end{cases}}\)
b) (4,5x - 2x) . (-11/7) = 11/14
=> 2,5x = 11/14 : (-11/7)
=> 2,5x = -1/2
=> x = -1/2 : 2,5
=> x = -0,2
\(\frac{4}{5}\)+ \(\frac{1}{5}\): \(\frac{-2}{15}\)= \(\frac{4}{5}\)+ \(\frac{1}{5}\)* \(\frac{-15}{2}\)=\(\frac{4}{5}\) + \(\frac{-3}{2}\)= \(\frac{-7}{10}\)
b = \(\frac{-7}{12}\). (\(\frac{3}{11}\)+ \(\frac{-14}{11}\)) + \(\frac{5}{6}\)= \(\frac{-7}{12}\). (-1) + \(\frac{5}{6}\)= \(\frac{7}{12}\)+ \(\frac{10}{12}\)= \(\frac{17}{12}\)