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\(2,5x+9=3,75x-13,5\)
\(\Rightarrow3,75x-2,5x=9+13,5\)
\(\Rightarrow1,25x=22,5\)
\(\Rightarrow x=18\)
Bài làm:
Ta có: \(x.2,5+9=x.3,75-13,5\)
\(\Leftrightarrow\frac{5}{2}x+9=\frac{15}{4}x-13,5\)
\(\Leftrightarrow\frac{15}{4}x-\frac{5}{2}x=13,5+9\)
\(\Leftrightarrow\frac{5}{4}x=\frac{45}{2}\)
\(\Leftrightarrow x=\frac{45}{2}\div\frac{5}{4}\)
\(\Rightarrow x=18\)
a, |x| - x = \(\frac{3}{4}\)
nếu x > hoặc = 0
suy ra |x| = x
|x| - x = 0
vậy x < 0
suy ra
|x| - ( -x ) = \(-\frac{3}{4}\)
|x| + x = \(-\frac{3}{4}\)
2 . x = \(-\frac{3}{4}\)
x = \(-\frac{3}{8}\)
nói rõ lại đề b hộ tôi vs
2 .
\(\left|x+\frac{4}{15}\right|-\left|-3,75\right|=-\left|-2,15\right|\)
\(\left|x+\frac{4}{15}\right|-3,75=-2,15\)
\(\left|x+\frac{4}{15}\right|=-2,15+3,75\)
\(\left|x+\frac{4}{15}\right|=1,6\)
+) \(x+\frac{4}{15}=16\)
\(\Rightarrow x=\frac{236}{15}\)
+) \(x+\frac{4}{15}=-16\)
\(\Rightarrow x=-\frac{244}{15}\)
\(\left|x+\frac{4}{15}\right|-\left|-3,75\right|=-\left|-2,15\right|\)
\(\Rightarrow\left|x+\frac{4}{15}\right|-3,75=-2,15\)
\(\Rightarrow\left|x+\frac{4}{15}\right|=-2,15+3,75\)
\(\Rightarrow\left|x+\frac{4}{15}\right|=1,6=\frac{8}{5}\)
\(\Rightarrow\left[\begin{array}{nghiempt}x+\frac{4}{15}=\frac{8}{5}\\x+\frac{4}{15}=\frac{-8}{5}\end{array}\right.\)\(\Rightarrow\left[\begin{array}{nghiempt}x=\frac{4}{3}\\x=\frac{-28}{15}\end{array}\right.\)
Vậy \(\left[\begin{array}{nghiempt}x=\frac{4}{3}\\x=\frac{-28}{15}\end{array}\right.\)
|x + 4/15| - |-3,75| = -|- 2,15|
=> |x + 4/15| - 3,75 = 2,15
=> |x + 4/15| = 59/10
=> \(\orbr{\begin{cases}x+\frac{4}{15}=\frac{59}{10}\\x+\frac{4}{15}=-\frac{59}{10}\end{cases}}\Rightarrow\orbr{\begin{cases}x=\frac{169}{30}\\x=\frac{-185}{30}\end{cases}}\)
\(\left|x+\frac{4}{15}\right|-\left|-3,75\right|=-\left|-2,15\right|\)
\(\left|x+\frac{4}{15}\right|-3,75=-2,15\)
\(\left|x+\frac{4}{15}\right|=-2,15+3,75\)
\(\left|x+\frac{4}{15}\right|=1,6\)
\(\left|x+\frac{4}{15}\right|=\frac{8}{5}\)
\(\Rightarrow\hept{\begin{cases}x+\frac{4}{15}=\frac{8}{5}\\x+\frac{4}{15}=\frac{-8}{5}\end{cases}\Rightarrow\hept{\begin{cases}x=\frac{8}{5}-\frac{4}{15}=\frac{4}{3}\\x=\frac{-8}{5}-\frac{4}{15}=\frac{-28}{15}\end{cases}}}\)
(-3,75).(-7,2)+2,8.3,75=3,75.(7,2+2,8)
=3,75.10
=37,5
kb vs mk nhé,đc ko?
3,6 - |x - 3,75| = -|-0,15|
3,6 - |x - 3,75| = -0,15
|x -3,75| = 3,6 + 0,15
|x - 3,75| = 3,75
\(\Rightarrow\orbr{\begin{cases}x-3,75=3,75\\x-3,75=-3,75\end{cases}}\Rightarrow\orbr{\begin{cases}x=7,5\\x=0\end{cases}}\)