\(4-\left(2\frac{1}{3}-x+\frac{1}{4}\right)=1-|1\frac{1}{6}-2\frac{5}{12}|+1\frac{1}{2}\)
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1.
\(\frac{2x+3}{4}-\frac{5x+3}{6}=\frac{3-4x}{12}\)
\(MC:12\)
Quy đồng :
\(\Rightarrow\frac{3.\left(2x+3\right)}{12}-\left(\frac{2.\left(5x+3\right)}{12}\right)=\frac{3x-4}{12}\)
\(\frac{6x+9}{12}-\left(\frac{10x+6}{12}\right)=\frac{3x-4}{12}\)
\(\Leftrightarrow6x+9-\left(10x+6\right)=3x-4\)
\(\Leftrightarrow6x+9-3x=-4-9+16\)
\(\Leftrightarrow-7x=3\)
\(\Leftrightarrow x=\frac{-3}{7}\)
2.\(\frac{3.\left(2x+1\right)}{4}-1=\frac{15x-1}{10}\)
\(MC:20\)
Quy đồng :
\(\frac{15.\left(2x+1\right)}{20}-\frac{20}{20}=\frac{2.\left(15x-1\right)}{20}\)
\(\Leftrightarrow15\left(2x+1\right)-20=2\left(15x-1\right)\)
\(\Leftrightarrow30x+15-20=15x-2\)
\(\Leftrightarrow15x=3\)
\(\Leftrightarrow x=\frac{3}{15}=\frac{1}{5}\)
a) \(\left|x\right|+\frac{1}{4}=\frac{1}{5}\)
\(\left|x\right|=\frac{1}{5}-\frac{1}{4}\)
\(\left|x\right|=\frac{-1}{20}\)(vô lý vì \(\left|x\right|\ge0\)với mọi x . Mà \(\frac{-1}{20}\)>0 )
Vậy không tồn tại x
b)\(\left|x+2\right|-\frac{1}{12}=\frac{1}{4}\)
\(\left|x+2\right|=\frac{1}{4}+\frac{1}{12}\)
\(\left|x+2\right|=\frac{1}{3}\)
\(\Rightarrow x+2\varepsilon\left\{\frac{1}{3};\frac{-1}{3}\right\}\)
+)\(x+2=\frac{1}{3}\Rightarrow x=\frac{-5}{3}\) +)\(x+2=\frac{-1}{3}\Rightarrow x=\frac{-7}{3}\)
Vậy \(x=\frac{-5}{3}\)hoặc \(x=\frac{-7}{3}\)
c)\(\left|x+5\right|=\frac{1}{7}-\left|\frac{4}{3}-\frac{1}{6}\right|\)
\(\left|x+5\right|=\frac{1}{7}-\frac{7}{6}\)
\(\left|x+5\right|=\frac{-43}{42}\)( vô lý vì \(\left|x+5\right|\ge0\)với mọi x , mà \(\frac{-43}{42}< 0\))
Vậy không tồn tại x
d)\(\left|x+\frac{5}{6}\right|=\left|\frac{1}{5}-\frac{2}{3}\right|+\frac{-3}{4}\)
\(\left|x+\frac{5}{6}\right|=\frac{7}{15}+\frac{-3}{4}\)
\(\left|x+\frac{5}{6}\right|=\frac{-17}{60}\)( Vô lý vì \(\left|x+\frac{5}{6}\right|\ge0\)với mọi x mà \(\frac{-17}{60}< 0\))
Vậy không tồn tại x
Câu 1:
a)\(\frac{3}{4}-0,25-\left[\frac{7}{3}+\left(-\frac{9}{2}\right)\right]-\frac{5}{6}\)
\(=\frac{3}{4}-\frac{1}{4}-\frac{14}{6}+\frac{27}{6}-\frac{5}{6}\)
\(=\frac{1}{2}-\frac{4}{3}\)
\(=-\frac{5}{6}\)
b)\(7+\left(\frac{7}{12}-\frac{1}{2}+3\right)-\left(\frac{1}{12}+5\right)\)
\(=7+\frac{1}{12}+3-\frac{1}{12}-5\)
\(=5\)
Câu 2:
\(\frac{3}{4}-\frac{5}{6}\le\frac{x}{12}< 1-\left(\frac{2}{3}-\frac{1}{4}\right)\)
\(-\frac{1}{12}\le\frac{x}{12}< 1-\frac{5}{12}\)
\(-\frac{1}{12}\le\frac{x}{12}< \frac{7}{12}\)
Vậy -1\(\le\)x<7
đổi hết thành ps rồi giải
gttđ > 0
cái này bn tự lm đc mà
cố lên
\(\Leftrightarrow4-\left(\frac{7}{3}-x+\frac{1}{4}\right)=1-\left|\frac{7}{6}-\frac{29}{12}\right|+\frac{3}{12}.\)
\(\Leftrightarrow4-\frac{31}{12}+x=1-\left|\frac{-15}{12}\right|+\frac{3}{12}\)
\(\Leftrightarrow\frac{17}{12}+x=1-\frac{15}{12}+\frac{3}{12}\)
\(\Leftrightarrow\frac{17}{12}+x=0\Leftrightarrow x=\frac{-17}{12}\)
\(4-\left(2\frac{1}{3}-x+\frac{1}{4}\right)=1-|1\frac{1}{6}-2\frac{5}{12}|+1\frac{1}{2}\)
\(4-\left(2\frac{1}{3}-x+\frac{1}{4}\right)=1+\frac{5}{4}+\frac{3}{2}\)
\(4-\left(\frac{7}{3}-x+\frac{1}{4}\right)=\frac{4+5+6}{4}\)
\(4-\left(\frac{7}{3}-x+\frac{1}{4}\right)=\frac{15}{4}\)
\(\frac{7}{3}-x+\frac{1}{4}=4-\frac{15}{4}\)
\(\frac{31}{12}-x=\frac{1}{4}\)
\(x=\frac{31}{12}-\frac{1}{4}=\frac{7}{3}\)