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Ta có: \(\frac{1}{2}.x+\frac{3}{5}.\left(x-2\right)=3\)
\(\Rightarrow\frac{1}{2}x+\frac{3}{5}x-\frac{6}{5}=3\)
\(\Rightarrow\frac{11}{10}x-\frac{6}{5}=3\)
\(\Rightarrow\frac{11}{10}x=3+\frac{6}{5}=\frac{21}{5}\)
\(\Rightarrow x=\frac{21}{5}:\frac{11}{10}=\frac{42}{11}\)
Vậy \(x=\frac{42}{11}\)
Ủng hộ tớ nha?
1)
\(\frac{3}{4}.x+\frac{x}{5}=\frac{1}{6}\)
\(x.\left(\frac{3}{4}+\frac{1}{5}\right)=\frac{1}{6}\)
\(x.\frac{19}{20}=\frac{1}{6}\)
\(x=\frac{1}{6}:\frac{19}{20}\)
\(x=\frac{10}{57}\)
2)
\(x+3\frac{1}{2}+x=24\frac{1}{4}\)
\(2x+3\frac{1}{2}=24\frac{1}{4}\)
\(2x=24\frac{1}{4}-3\frac{1}{2}\)
\(2x=\frac{83}{4}\)
\(x=\frac{83}{4}:2\)
\(x=\frac{83}{8}\)
a.
\(\frac{4}{7}x-\frac{2}{3}=\frac{1}{5}\)
\(\frac{4}{7}x=\frac{1}{5}+\frac{2}{3}\)
\(\frac{4}{7}x=\frac{3+10}{15}\)
\(\frac{4}{7}x=\frac{13}{15}\)
\(x=\frac{13}{15}\div\frac{4}{7}\)
\(x=\frac{13}{15}\times\frac{7}{4}\)
\(x=\frac{91}{60}\)
b.
\(\frac{2}{9}+\frac{7}{8}x=\frac{1}{3}\)
\(\frac{7}{8}x=\frac{1}{3}-\frac{2}{9}\)
\(\frac{7}{8}x=\frac{3-2}{9}\)
\(\frac{7}{8}x=\frac{1}{9}\)
\(x=\frac{1}{9}\div\frac{7}{8}\)
\(x=\frac{1}{9}\times\frac{8}{7}\)
\(x=\frac{8}{63}\)
Chúc bạn học tốt
\(x.3\frac{1}{4}+\left(\frac{-7}{6}\right)x-1\frac{2}{3}=\frac{5}{12}\)
\(x.\frac{13}{4}+\left(\frac{-7}{6}\right)x-\frac{5}{3}=\frac{5}{12}\)
\(x\left[\frac{13}{4}+\left(\frac{-7}{6}\right)\right]-\frac{5}{3}=\frac{5}{12}\)
\(x\frac{25}{12}-\frac{5}{3}=\frac{5}{12}\)
\(x\frac{25}{12}=\frac{5}{12}+\frac{5}{3}\)
\(x\frac{25}{12}=\frac{25}{12}\)
\(x=\frac{25}{12}:\frac{25}{12}\)
\(x=1\)
\(\frac{1}{2}.x-\frac{3}{5}=\frac{4}{3}\)
=>\(\frac{1}{2}x=\frac{4}{3}+\frac{3}{5}=\frac{29}{15}\)
=> x= \(\frac{29}{15}:\frac{1}{2}=\frac{29}{15}.\frac{2}{1}=\frac{58}{15}\)
b) \(\frac{2}{9}+\frac{7}{8}.x=\frac{1}{3}\)
\(\frac{1}{3}-\frac{2}{9}=\frac{7}{8}.x\)
\(\frac{7}{8}.x=\frac{1}{9}\)
\(x=\frac{1}{9}:\frac{7}{8}\)
\(x=\frac{8}{63}\)
c) \(\frac{4}{5}+\frac{5}{7}:x=\frac{1}{3}\)
\(\frac{5}{7}:x=\frac{1}{3}-\frac{4}{5}\)
\(\frac{5}{7}:x=\frac{-7}{15}\)
\(x=\frac{5}{7}:\frac{-7}{15}\)
\(x=\frac{75}{-49}\)
b) \(\frac{2}{9}+\frac{7}{8}x=\frac{1}{3}\)
\(\frac{7}{8}x=\frac{1}{3}-\frac{2}{9}=\frac{1}{9}\)
\(x=\frac{1}{9}:\frac{7}{8}=\frac{8}{63}\)
c) \(\frac{4}{5}+\frac{5}{7}:x=\frac{1}{3}\)
\(\frac{5}{7}:x=\frac{1}{3}-\frac{4}{5}=-\frac{7}{15}\)
\(x=\frac{5}{7}:\left(-\frac{7}{15}\right)=-\frac{75}{49}\)
a)\(\frac{3}{4}+\frac{1}{4}:x=-3\)
\(\frac{1}{4}:x=-3-\frac{3}{4}\)
\(\frac{1}{4}:x=\frac{-15}{4}\)
\(x=\frac{1}{4}:\frac{-15}{4}\)
\(x=\frac{-1}{15}\)
b) \(\frac{-5}{x}=\frac{20}{28}\)
\(\Rightarrow\)\(-5:x=\frac{20}{28}\)
\(x=-5:\frac{20}{28}\)
\(x=-7\)
c)\(\frac{2}{3}x-\frac{1}{2}=\frac{1}{10}\)
\(\frac{2}{3}x\) \(=\frac{1}{10}+\frac{1}{2}\)
\(\frac{2}{3}x\) \(=\frac{6}{10}\)
\(x\) \(=\frac{6}{10}:\frac{2}{3}\)
\(x\) \(=\frac{9}{10}\)
d)\(1\frac{2}{9}x+\frac{8}{3}=\frac{-2}{3}\)
\(1\frac{2}{9}x\) \(=\frac{-2}{3}-\frac{8}{3}\)
\(1\frac{2}{9}x\) \(=\frac{-10}{3}\)
\(x\) \(=\frac{-10}{3}:1\frac{2}{9}\)
\(x\) \(=\frac{-30}{11}\)
Câu Cuối)\(\frac{x}{2}-\frac{11}{5}=\frac{7}{8}.\frac{64}{49}\)
\(\Rightarrow\) \(x:2-\frac{11}{5}=\frac{7}{8}.\frac{64}{49}\)
\(x:2-\frac{11}{5}=\frac{448}{392}\)
\(x:2\) \(=\frac{448}{392}+\frac{11}{5}\)
\(x:2\) \(=\frac{117}{35}\)
\(x\) \(=\frac{117}{35}.2\)
\(x\) \(=\frac{234}{35}\)
Bạn cho mình 1 .
Chúc bạn học tốt .
đếch giúp!ai bảo câu hỏi của ngọc trả lời ko tử tế cơ!thằng nào ngu như mày thì thằng đó chết nhe răng giống mày!