tim x
3/5 : (x-5)=1/2
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a) Đặt A(x)=0
\(\Leftrightarrow-4x-5=0\)
\(\Leftrightarrow-4x=5\)
hay \(x=-\dfrac{5}{4}\)
b) Đặt B(x)=0
\(\Leftrightarrow3\left(2x-1\right)-2\left(x+1\right)=0\)
\(\Leftrightarrow6x-3-2x-2=0\)
\(\Leftrightarrow4x=5\)
hay \(x=\dfrac{5}{4}\)
Câu 4:
\(=\dfrac{a\left(a-b\right)-c\left(a-b\right)}{a\left(a+b\right)-c\left(a+b\right)}=\dfrac{a-b}{a+b}\)
\(C=\left(5^3-1\right)\cdot\left(5^3-2\right)\cdot...\cdot\left(5^3-125\right)\cdot...\cdot\left(5^3-2014\right)\cdot\left(5^3-2015\right)=0\)
\(\left(\frac{13}{4}-x.\frac{8}{5}\right).3=4\)
\(\left(\frac{13}{4}-x\cdot\frac{8}{5}\right)=4:3\)
\(\frac{13}{4}-x\cdot\frac{8}{5}=\frac{4}{3}\)
\(x\cdot\frac{8}{5}=\frac{13}{4}-\frac{4}{3}\)
\(x\cdot\frac{8}{5}=\frac{23}{12}\)
\(x=\frac{23}{12}:\frac{8}{5}\)
\(x=\frac{115}{96}\)
\(\frac{3}{5}:\left(x-5\right)=\frac{1}{2}\) \(x-5=\frac{3}{5}:\frac{1}{2}\) \(x-5=\frac{6}{5}\) \(x=\frac{6}{5}+5\) \(x=\frac{31}{5}\)
\(\frac{3}{5}\div\left(x-5\right)=\frac{1}{2}\)
\(x-5=\frac{3}{5}\div\frac{1}{2}\)
\(x-5=\frac{6}{5}\)
\(x=\frac{6}{5}+5\)
\(x=\frac{6}{25}\)