Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(\frac{0,25\cdot x}{x}=\frac{5}{6}:0,125\)
\(\Leftrightarrow\frac{\frac{25}{100}\cdot x}{x}=\frac{5}{6}:\frac{125}{1000}\)
\(\Leftrightarrow\frac{\frac{1}{4}\cdot x}{x}=\frac{5}{6}:\frac{1}{8}\)
\(\Leftrightarrow\frac{\frac{1}{4}\cdot x}{x}=\frac{40}{6}\)
\(\Leftrightarrow\frac{1}{4}\cdot x=\frac{40}{6}\cdot x\)
=> x không thỏa mãn
Ta có: \(A=\frac{\frac{3}{11}+1-\frac{3}{7}}{3+\frac{9}{11}-\frac{9}{7}}-\frac{\frac{1}{3}+0,25-\frac{1}{5}+0,125}{\frac{7}{6}+\frac{7}{8}-0,7+\frac{7}{16}}\)
\(=\frac{3\left(\frac{1}{11}+\frac{1}{3}-\frac{1}{7}\right)}{9\left(\frac{1}{3}+\frac{1}{11}-\frac{1}{7}\right)}-\frac{2\left(\frac{1}{6}+\frac{1}{8}-\frac{1}{10}+\frac{1}{16}\right)}{7\left(\frac{1}{6}+\frac{1}{8}-\frac{1}{10}+\frac{1}{16}\right)}\)
\(=\frac{3}{9}-\frac{2}{7}=\frac{1}{3}-\frac{2}{7}=\frac{7}{21}-\frac{6}{21}=\frac{1}{21}\)
Vậy \(A=\frac{1}{21}\)
\(\left(13\frac{1}{4}-2\frac{5}{27}-10\frac{3}{6}\right)\)\(.230\frac{1}{25}+46\frac{3}{4}\)
\(=\)\(\left(\frac{53}{4}-\frac{59}{27}-\frac{21}{2}\right)\)\(.\frac{5751}{25}+\frac{187}{4}\)
\(=\frac{304803}{100}-\frac{12567}{25}-\frac{120771}{50}+\frac{187}{4}\)
\(=\frac{304803}{100}-\frac{50268}{100}-\frac{241542}{100}+\frac{4675}{100}\)
\(=\frac{304803-50268-241542+4675}{100}\)
\(=\frac{17668}{100}\)
\(=\frac{4417}{25}\)
làm 1 bài mẫu nha
a) \(\left(\frac{1}{3}.x\right):\frac{2}{3}=\frac{25}{6}\)
\(\Rightarrow\frac{1}{3}x=\frac{25}{9}\)
\(\Rightarrow x=\frac{25}{9}:\frac{1}{3}\)
\(\Rightarrow x=\frac{25}{3}\)
các bài sau dễ lắm
a) \(\left(\frac{1}{3}x\right):\frac{2}{3}=1\frac{2}{3}:\frac{2}{5}\)
\(\Rightarrow\frac{1}{3}x:\frac{2}{3}=\frac{25}{6}\)
\(\Rightarrow\frac{1}{3}x=\frac{5}{3}\)
\(\Rightarrow x=\frac{5}{3}:\frac{1}{3}\)
\(\Rightarrow x=5\)
a) \(\left(\frac{3}{7}\right)^{21}:\left(\frac{9}{47}\right)^6=\left(\frac{3}{7}\right)^{21}:\left[\left(\frac{3}{7}\right)^2\right]^6=\left(\frac{3}{7}\right)^{21}:\left(\frac{3}{7}\right)^{12}=\left(\frac{3}{7}\right)^{21-12}=\left(\frac{3}{7}\right)^9\)
b) \(\frac{390}{130}^4=3^4=81\)
c) \(\left(0,125\right)^3.512=\frac{1}{512}.512=1\)
\(0.25:3x=\frac{5}{6}\)\(:0.125\)
\(\Rightarrow\)\(0.25:3x=\frac{20}{3}\)
\(\Rightarrow\)\(3x=0.25:\frac{20}{3}\)
\(\Rightarrow\)\(3x=\frac{3}{80}\)
\(\Rightarrow\)\(x=\frac{1}{80}\)