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\(\frac{7+x}{8}=\frac{x-10}{3}\)
\(\Leftrightarrow3\left(7+x\right)=8\left(x-10\right)\)
\(\Leftrightarrow21+3x=8x-80\)
\(\Leftrightarrow3x-8x=-80-21\)
\(\Leftrightarrow-5x=-101\)
\(\Leftrightarrow x=\frac{101}{5}\)
\(\Rightarrow3\left(7+x\right)=8\left(x-10\right)\)
\(\Rightarrow21+3x=8x-80\)
\(\Rightarrow5x=101\)
\(\Rightarrow x=\frac{101}{5}\)
\(\Rightarrow\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{13}{15}-\frac{7}{10}\)
\(\Rightarrow\left(\frac{13}{21}+x\right).\frac{7}{12}=\frac{1}{6}\)
\(\Rightarrow\frac{13}{21}+x=\frac{1}{6}.\frac{12}{7}=\frac{2}{7}\)
\(\Rightarrow x=\frac{2}{7}-\frac{13}{21}=\frac{-1}{3}\)
\(\frac{8}{23}\cdot\frac{46}{24}-x=\frac{1}{3}\)
=> \(\frac{2}{3}-x=\frac{1}{3}\)
=> \(x=\frac{1}{3}\)
\(\frac{10}{12}\div x=\frac{28}{9}\cdot\frac{3}{56}\)
=> \(\frac{10}{12}\div x=\frac{1}{6}\)
=> \(x=\frac{60}{12}=5\)
\(\frac{x-12}{4}=\frac{1}{2}\)
=> \(\left(x-12\right)\cdot2=4\cdot1\)
=> \(2x-24=4\)
=> \(2x=28\)
=> \(x=14\)
\(a\left(x-\frac{1}{2}\right)^3=\frac{1}{27}\\ =>\left(x-\frac{1}{2}\right)=\frac{1}{3}\\ =>x=\frac{1}{3}+\frac{1}{2}\\ =>x=\frac{5}{6}\)
b) \(\left(x+\frac{1}{2}\right)^2=\frac{4}{25}\\ =>\left(x+\frac{1}{2}\right)=\frac{2}{5}\\ =>x=\frac{-1}{10}\)
d) (2x+3)2016=(2x+3)2018 khi 2x+3=0 hoặc 1
Nếu 2x+3=0
=2x=-3 ( loại )
Nếu 2x+3=1
=>2x=-2
=>x=-1 ( thỏa )
x/10=0,3
=>x/10=3/10
=> x=3
giup minh voi cam on cac ban