mỗi lần mk chỉ giải 3 bài :
ok....
hk tốt #
a) \(x+\frac{7}{12}=\frac{3}{4}\Rightarrow x=\frac{3}{4}-\frac{7}{12}\Rightarrow x=\frac{9}{12}-\frac{7}{12}\Rightarrow x=\frac{2}{12}=\frac{1}{6}\)
b) \(\frac{4}{5}x=\frac{-8}{35}\Rightarrow x=-\frac{8}{35}:\frac{4}{5}\Rightarrow x=-\frac{8}{35}\cdot\frac{5}{4}\Rightarrow x=-\frac{2}{7}\)
c) \(y-\frac{5}{7}=-\frac{19}{21}\Rightarrow y=-\frac{19}{21}+\frac{5}{7}\Rightarrow y=-\frac{19}{21}+\frac{15}{21}\Rightarrow y=-\frac{4}{21}\)
hk tốt !
\(\frac{1}{3}+\frac{2}{3}x=\frac{1}{4}\)
\(\Rightarrow\frac{2}{3}x=\frac{1}{4}-\frac{1}{3}\)
\(\Rightarrow\frac{2}{3}x=\frac{-1}{12}\)
\(\Rightarrow x=-\frac{1}{12}:\frac{2}{3}=-\frac{1}{12}\cdot\frac{3}{2}\Rightarrow x=\frac{-3}{8}\)
lần này đúng nè #
\(d\)) \(\frac{1}{3}+\frac{2}{3}x=\frac{1}{4}\)
\(\Rightarrow\frac{2}{3}x=\frac{1}{4}-\frac{1}{3}=-\frac{1}{12}\)
\(\Rightarrow x=-\frac{1}{12}:\frac{2}{3}=-\frac{1}{12}\cdot\frac{3}{2}=-\frac{1}{8}\)
e ) \(x:\frac{3}{4}+\frac{1}{4}=\frac{2}{3}\)
\(\Rightarrow x:\frac{3}{4}=\frac{2}{3}-\frac{1}{4}=\frac{5}{12}\)
\(\Rightarrow x=\frac{3}{4}\cdot\frac{5}{12}=\frac{5}{16}\)
f ) \(2x-25\%x=\frac{1}{2}\)
\(2x-\frac{1}{4}x=\frac{1}{2}\)
\(\Rightarrow x\left(2-\frac{1}{4}\right)=\frac{1}{2}\)
\(\Rightarrow\frac{7}{4}x=\frac{1}{2}\)
\(\Rightarrow x=\frac{1}{2}:\frac{7}{4}=\frac{1}{2}\cdot\frac{4}{7}=\frac{2}{7}\)
hk tốt #
g)\(\frac{1}{3}x+\frac{2}{5}\left(x-1\right)=0\)
\(\Rightarrow\frac{1}{3}x+\frac{2}{5}x-\frac{2}{5}=0\)
\(\Rightarrow x\left(\frac{1}{3}+\frac{2}{5}\right)-\frac{2}{5}=0\)
\(\Rightarrow x\left(\frac{5}{15}+\frac{6}{15}\right)=0+\frac{2}{5}\)
\(\Rightarrow\frac{11}{15}x=\frac{2}{5}\Rightarrow x=\frac{2}{5}:\frac{11}{15}=\frac{2}{5}\cdot\frac{15}{11}=\frac{6}{11}\)
~ mưa ~
