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\(\left(\frac{-2}{3}+\frac{3}{7}\right):\frac{4}{5}+\left(\frac{-1}{3}+\frac{4}{7}\right):\frac{4}{5}\)
\(=\left(\frac{-2}{3}+\frac{3}{7}+\frac{-1}{3}+\frac{4}{7}\right):\frac{4}{5}\)
\(=\left[\left(\frac{-2}{3}+\frac{-1}{3}\right)+\left(\frac{3}{7}+\frac{4}{7}\right)\right]:\frac{4}{5}\)
\(=\left[\left(-1+1\right)\right]:\frac{4}{5}\)
\(=0:\frac{4}{5}=0\)
~ Hok tốt ~
1,\(\frac{2}{9}.\left(x-\frac{9}{4}\right)+\frac{1}{2}=\frac{3}{7}.\left(7-\frac{1}{6}\right)+\frac{1}{3}\)
\(\frac{2}{9}.\left(x-\frac{9}{4}\right)+\frac{1}{2}=\frac{3}{7}.\frac{41}{6}+\frac{1}{3}\)
\(\frac{2}{9}.\left(x-\frac{9}{4}\right)+\frac{1}{2}=\frac{41}{14}+\frac{1}{3}\)
\(\frac{2}{9}.\left(x-\frac{9}{4}\right)+\frac{1}{2}=\frac{137}{42}\)
\(\frac{2}{9}.\left(x-\frac{9}{4}\right)=\frac{137}{42}-\frac{1}{2}\)
\(\frac{2}{9}.\left(x-\frac{9}{4}\right)=\frac{58}{21}\)
\(\left(x-\frac{9}{4}\right)=\frac{5}{2}:\frac{2}{9}\)
\(\left(x-\frac{9}{4}\right)=\frac{45}{4}\)
\(x=\frac{45}{4}+\frac{9}{4}\)
\(x=\frac{27}{2}\)
=> 4/15 -5/3 +(1/2-3x)=-19/15
=>4/15+1/2-3x=2/5
=>3x=11/30
=>x=11/90
study well
k nha
ủng hộ mk nhé
Mk không viết lại đề!
\(\frac{4}{15}-\frac{25}{15}+\left(\frac{1}{2}-3.x\right)-\frac{12}{15}=\frac{2}{3}-\left(\frac{9}{15}+\frac{20}{15}\right)\)
\(\frac{-21}{15}-\frac{12}{15}+\left(\frac{1}{2}-3.x\right)=\frac{10}{15}-\frac{29}{15}\)
\(\frac{-33}{15}+\left(\frac{1}{2}-3.x\right)=\frac{-19}{15}\)
\(\frac{1}{2}-3.x=\frac{-19}{15}-\frac{-33}{15}\)
\(\frac{1}{2}-3.x=\frac{-19}{15}+\frac{33}{15}\)
\(\frac{1}{2}-3.x=\frac{14}{15}\)
\(\frac{14}{15}-\frac{1}{2}=3.x\)
\(\frac{28}{30}-\frac{15}{30}=3.x\)
\(\frac{13}{30}:\frac{3}{1}=x\)
\(\frac{13}{60}=x\)
Hội con 🐄 chúc bạn học tốt!!!