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làm tiếp cái trước(ấn nhầm)
\(x=\frac{5}{42}-\frac{15}{28}\)
\(x=\frac{5.4}{6.4.7}-\frac{15.6}{4.7.6}\)
\(x=\frac{20}{168}-\frac{90}{168}\)
\(x=\frac{-70}{168}\)
\(x=\frac{-5}{12}\)
2.
1.
\(\frac{11}{13}-\left(\frac{5}{42}-x\right)=-\left(\frac{15}{28}-\frac{11}{13}\right)\)
\(\frac{11}{13}-\frac{5}{42}+x=-\frac{15}{28}+\frac{11}{13}\)
\(\frac{11}{13}-\frac{11}{13}-\frac{5}{42}+\frac{15}{28}=-x\)
\(\frac{11}{13}-\left(\frac{5}{42}-x\right)=-\left(\frac{15}{28}-\frac{11}{13}\right)\)
\(\left(\frac{5}{42}-x\right)=\frac{11}{13}-\left(-\frac{15}{28}-\frac{11}{13}\right)\)
\(\frac{5}{42}-x\)= \(\frac{11}{13}-\left(-\frac{503}{364}\right)\)
\(\frac{5}{42}-x\)= \(\frac{811}{364}\)
\(x=\frac{5}{42}-\frac{811}{364}\)
\(x=-\frac{329}{156}\)
Phần tìm x tự tính ra
\(\frac{11}{13}-\left(\frac{5}{42}-x\right)=-\left(\frac{5}{28}-\frac{11}{13}\right)\)
\(\frac{11}{13}-\frac{5}{42}+x=-\frac{5}{28}+\frac{11}{13}\)
\(x=-\frac{5}{28}+\frac{11}{13}-\frac{11}{13}+\frac{5}{42}\)
\(x=\left(\frac{11}{13}-\frac{11}{13}\right)-\left(\frac{5}{28}-\frac{5}{42}\right)\)
\(x=-\left(\frac{15}{84}-\frac{10}{84}\right)\)
\(x=-\frac{5}{84}\)
\(\Leftrightarrow\frac{11}{13}-\frac{5}{42}+x=-\left(-\frac{113}{364}\right)\)
\(\Leftrightarrow\frac{397}{546}+x=\frac{113}{364}\)
\(\Leftrightarrow x=\frac{113}{364}-\frac{397}{546}=-\frac{5}{12}\)
\(\Rightarrow\frac{5}{42}-x=\frac{11}{13}+\left(\frac{15}{28}-\frac{11}{13}\right)\)
\(\Rightarrow\frac{5}{42}-x=\frac{15}{28}\)
\(\Rightarrow x=\frac{5}{42}-\frac{15}{28}=-\frac{5}{12}\)
\(\left|x-\frac{4}{15}\right|-\left|-3,75\right|=-2,15\)
\(\left|x-\frac{4}{5}\right|-3,75=-2,15\)
\(\left|x-\frac{4}{5}\right|=-2,15+3,75\)
\(\left|x-\frac{4}{5}\right|=\frac{8}{5}\)
\(\Rightarrow\orbr{\begin{cases}x-\frac{4}{5}=\frac{8}{5}\\x-\frac{4}{5}=-\frac{8}{5}\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=\frac{12}{5}\\x=-\frac{4}{5}\end{cases}}\)