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a) x- 25%x= 1/2<=>x-1/4x=1/2<=>3/4x=1/2<=>x=1/2:3/4=2/3
b)\(\left(50\%x+2\frac{1}{4}\right).\frac{-2}{3}=\frac{17}{6}\Leftrightarrow-\frac{1}{3}x-\frac{3}{2}=\frac{17}{6}\Leftrightarrow x=-13\)
c)\(\left(3\frac{x}{7}+1\right):\left(-4\right)=\frac{-1}{28}\Leftrightarrow\frac{28+x}{7}:\left(-4\right)=\frac{-1}{28}\Leftrightarrow\frac{28+x}{-28}=\frac{1}{-28}\Leftrightarrow28+x=1\Leftrightarrow x=-27\)
d)\(\left(1\frac{1}{3}-25\%-\frac{5}{12}\right)-2x=1,6:\frac{3}{5}\Leftrightarrow\frac{2}{3}-2x=\frac{8}{3}\Leftrightarrow x=-1\)
a)x-25%x=1/2
x-1/4x=1/2
x.(1-1/4)=1/2
x.3/4=1/2
x=1/2:3/4
x=2/3
=> \(\frac{4}{3}-\frac{1}{4}-\frac{5}{12}-2x=1,6:0,6\)
=> \(\frac{2}{3}-2x=\frac{8}{3}\)
=> \(2x=\frac{8}{3}-\frac{2}{3}\)
=> \(2x=2\)
=> \(x=2:2\)
=> \(x=1\)
a)\(\frac{x}{150}\)=\(\frac{5}{6}\).\(\frac{-7}{25}\)
⇒\(\frac{x}{150}\)=\(\frac{-7}{30}\)
⇒30x=-7.150
⇒x=\(\frac{-1050}{30}\)=-35
vậy x=-35
b)\(\frac{1}{2}\).x+\(\frac{3}{5}.x\)\(=3\)
⇒\(\frac{11}{10}x=3\)
\(\Rightarrow x=\frac{30}{11}\)
Vậy x=\(\frac{30}{11}\)
c)\(25\%.x+x=2\frac{1}{2}\)
\(\Rightarrow\frac{1}{4}.x+x=\frac{5}{2}\)
⇒\(\frac{5}{4}x=\frac{5}{2}\)
⇒\(x=2\)
Vậy\(x=2\)
d)\(\left|2x\right|=15\)
\(\Rightarrow\left[{}\begin{matrix}2x=15\\2x=-15\end{matrix}\right.\)
⇒\(\left[{}\begin{matrix}x=\frac{15}{2}\\x=-\frac{15}{2}\end{matrix}\right.\)
Vậy \(x=\frac{15}{2}\)hoặc \(x=\frac{-15}{2}\)
//học tốt//
\(25^x+5^{2x+1}=150\)
\(\Leftrightarrow5^{x+1}+5^{2x+1}=5^2+5^3\)
\(\Rightarrow x+1+2x+1=2+3\)
\(\Leftrightarrow3x=3\Rightarrow x=1\)
a) \(\frac{1}{12}x-75\%.x=-1\frac{2}{3}\)
\(\frac{1}{12}x-\frac{3}{4}x=\frac{-5}{3}\)
\(\left(\frac{1}{12}-\frac{3}{4}\right)x=\frac{-5}{3}\)
\(\left(\frac{1}{12}-\frac{9}{12}\right)x=\frac{-5}{3}\)
\(\frac{-2}{3}x=\frac{-5}{3}\)
\(x=\frac{-5}{3}:\left(\frac{-2}{3}\right)\)
\(x=\frac{-5}{3}.\left(\frac{3}{-2}\right)\)
\(x=\frac{-5.3}{3.\left(-2\right)}\)
\(x=\frac{-5.1}{1.\left(-2\right)}\)
\(x=\frac{-5}{-2}\)
Vậy \(x=\frac{5}{2}\)
b) \(\left(\frac{-2x}{5}+1\right):\left(-5\right)+\frac{-1}{25}=??????\)
Câu b đề ko có đầy đủ nên mình ko thể làm đc nha pạn!!
(2\(x\) - 1)3 = (-150) + 25
(2\(x\) - 1)3 = - 125
(2\(x\) - 1)3 = (-5)3
2\(x\) - 1 = - 5
2\(x\) = - 5 + 1
2\(x\) = -4
\(x=-4:2\)
\(x=-2\)
Vậy \(x=-2\)