A,x-\(\frac{2}{5}=\frac{5}{7}\)
B,\(\frac{-2}{5}x=\frac{4}{15}\)
C,2x(\(x-\frac{1}{7}\))
D,\(\frac{1}{2}+\frac{3}{4}x=\frac{1}{4}\)
E,\(\frac{5}{6}+\frac{1}{6}:x\frac{1}{4}\)
F,\(\frac{11}{12}-\left(\frac{2}{5}+x\right)=\frac{2}{5}\)
G,\(\frac{8}{15}:x=\frac{-20}{21}\)
H,\(\frac{3}{4}+\frac{1}{4}:x=\frac{2}{5}\)
K,\(x+\frac{1}{3}=\frac{2}{5}-\left(\frac{-1}{3}\right)\)
a,x-2/5=5/7
x=5/7+2/5
x=39/35
b,-2/5.x=4/15
x=4/15:-2/5
x=-2/3
a) \(x-\frac{2}{5}=\frac{5}{7}\)
\(x=\frac{2}{5}+\frac{5}{7}\)
\(x=\frac{14}{35}+\frac{25}{35}=\frac{39}{35}\)
b)
\(\frac{-2}{5}x=\frac{4}{15}\)
\(x=\frac{4}{15}:-\frac{2}{5}\)
\(x=\frac{4}{15}\cdot-\frac{5}{2}=-\frac{2}{3}\)
c) \(2x\left(x-\frac{1}{7}\right)=2x^2-\frac{2x}{7}\)
d) \(\frac{1}{2}+\frac{3}{4}x=\frac{1}{4}\)
\(\frac{3}{4}x=\frac{1}{4}-\frac{1}{2}\)
\(\frac{3}{4}x=-\frac{1}{4}\)
\(x=-\frac{1}{4}\cdot\frac{4}{3}=-\frac{1}{3}\)
f) \(\frac{11}{12}-\left(\frac{2}{5}+x\right)=\frac{2}{5}\)
\(\frac{2}{5}+x=\frac{11}{12}-\frac{2}{5}=\frac{31}{60}\)
\(x=\frac{31}{60}-\frac{2}{5}=\frac{7}{60}\)
