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bn ơi ko thì bn làm từng phép một cũng đc nhé các bn giải hộ mình mai mình phải nộp rồi
a: \(\Leftrightarrow\left(\dfrac{13}{4}:x\right)\cdot\left(-\dfrac{5}{4}\right)=\dfrac{-10}{6}-\dfrac{5}{6}=\dfrac{-15}{6}=\dfrac{-5}{2}\)
\(\Leftrightarrow\dfrac{13}{4}:x=\dfrac{5}{2}\cdot\dfrac{5}{4}=\dfrac{25}{8}\)
hay \(x=\dfrac{13}{4}:\dfrac{25}{8}=\dfrac{13}{4}\cdot\dfrac{8}{25}=\dfrac{26}{25}\)
b: \(\Leftrightarrow\dfrac{3}{4}:x=\dfrac{11}{36}-\dfrac{1}{4}=\dfrac{2}{36}=\dfrac{1}{18}\)
=>\(x=\dfrac{3}{4}:\dfrac{1}{18}=\dfrac{54}{4}=\dfrac{27}{2}\)
c: \(\Leftrightarrow\left(-\dfrac{6}{5}+x\right):\left(-3.6\right)=-\dfrac{7}{4}+\dfrac{1}{4}\cdot8=\dfrac{1}{4}\)
=>x-6/5=-9/10
=>x=3/10
\(\left(3\frac{1}{4}-x\right).1\frac{1}{4}=-1+\frac{1}{20}\)
\(\Leftrightarrow\left(\frac{13}{4}-x\right).\frac{5}{4}=\frac{-20}{20}+\frac{1}{20}\)
\(\Leftrightarrow\left(\frac{13}{4}-x\right).\frac{5}{4}=\frac{-19}{20}\)
\(\Leftrightarrow\frac{13}{4}-x=\frac{-19}{20}\div\frac{5}{4}\)
\(\Leftrightarrow\frac{325}{100}-x=\frac{-76}{100}\)
\(\Leftrightarrow x=\frac{325}{100}+\frac{76}{100}\)
\(\Leftrightarrow x=\frac{401}{100}\)
\(3\frac{1}{4}x-\frac{7}{6}x=\frac{-5}{12}+\frac{12}{3}\)
= \(\frac{13}{4}x-\frac{7}{6}x=\frac{-5}{12}+\frac{12}{3}\)
= \(x.\left(\frac{13}{4}-\frac{7}{6}\right)=\frac{43}{12}\)
= \(x.\frac{25}{12}=\frac{45}{12}\)
\(x=\frac{45}{12}:\frac{25}{12}\)
\(x=\frac{9}{5}\)
\(3\frac{1}{4}x-\frac{7}{6}x=-\frac{5}{12}+\frac{12}{3}\)
\(\frac{13}{4}x-\frac{7}{6}x=-\frac{5}{12}+\frac{48}{12}\)
\(\left(\frac{13}{4}-\frac{7}{6}\right)x=\frac{43}{12}\)
\(\frac{25}{12}x=\frac{43}{12}\)
\(x=\frac{43}{25}\)
a: =>(2x+1/2)^2=1/4
=>2x+1/2=1/2 hoặc 2x+1/2=-1/2
=>x=-1/2 hoặc x=0
b: =>(x-1/5)^2=49
=>x-1/5=7 hoặc x-1/5=-7
=>x=-6,8 hoặc x=7,2
c: =>1,2x=12
=>x=10
d: =>3/4x+1/2x+1/2=-11/4
=>5/4x=-11/4-2/4=-13/4
=>x=-13/5
e: =>-0,25x+1,25x=0,2
=>x=0,2
\(\dfrac{8}{9}\) : ( 2 - 3 \(\times\) y) = \(\dfrac{5}{3}\)
2 - 3 \(\times\) y = \(\dfrac{8}{9}\) : \(\dfrac{5}{3}\)
2 - 3 \(\times\) y = \(\dfrac{8}{15}\)
3 \(\times\) y = 2 - \(\dfrac{8}{15}\)
3 \(\times\) y = \(\dfrac{22}{15}\)
y = \(\dfrac{22}{15}\) : 3
y = \(\dfrac{22}{45}\)