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\(-25\%x-x=1.25\)
\(-\frac{1}{4}x-x=\frac{5}{4}\)
\(\left(-\frac{1}{4}-1\right)\cdot x=\frac{5}{4}\)
\(-\frac{5}{4}\cdot x=\frac{5}{4}\)
\(x=-\frac{5}{4}:\frac{5}{4}\)
\(x=-1\)
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Đề: \(25\%.x+x=-1,25\)
\(\Leftrightarrow25\%.2x=-1,25\)
\(\Leftrightarrow\frac{25}{100}.2x=-\frac{125}{100}\)
\(\Leftrightarrow\frac{1}{4}.2x=\frac{5}{4}\)
\(\Leftrightarrow2x=\frac{5}{4}:\frac{1}{4}=\frac{5}{4}.4\)
\(\Leftrightarrow2x=5\)
\(\Leftrightarrow x=5:2=\frac{5}{2}\)
Chúc Cỏ học tốt!
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a: \(=\dfrac{5}{4}\cdot\dfrac{2}{5}\cdot\dfrac{17}{21}\cdot\dfrac{7}{34}=\dfrac{1}{2}\cdot\dfrac{1}{2}\cdot\dfrac{1}{3}=\dfrac{1}{12}\)
b: =>0,5^x(0,5+1)=1,5
=>0,5^x=1
=>x=0
c: =>x*0,05-0,25*x=-1,2
=>-0,3*x=-1,2
=>x=4
d: =>x-1=1 hoặc x-1=-1
=>x=0 hoặc x=2
e: =5+4=9
25%x+x=1,25
1/4x+x=1,25
x(1/4+1)=1,25
x. 5/4=1,25
x=1,25:5/4=1
Ta có: \(25\%x+x=1.25\)
\(\Leftrightarrow x\cdot\dfrac{5}{4}=\dfrac{5}{4}\)
hay x=1