Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(a,\)\(\frac{1}{2}-\frac{3}{4}.\frac{-6}{5}\)
\(=\frac{1}{2}-\frac{-9}{10}\)
\(=\frac{1}{2}+\frac{9}{10}\)
\(=\frac{7}{5}\)
\(b,\frac{3}{8}+2^2-\frac{3}{8}\)
\(=\left(\frac{3}{8}-\frac{3}{8}\right)+2^2\)
\(=0+4\)
\(=4\)
a) \(\frac{1}{2}-\frac{3}{4}.\left(-\frac{6}{5}\right)\)\(=\frac{1}{2}-\left(-\frac{9}{10}\right)\)\(=\frac{1}{2}+\frac{9}{10}=\frac{5}{10}+\frac{9}{10}=\frac{14}{10}=\frac{7}{5}\)
b) \(\frac{3}{8}+2^2-\frac{3}{8}=\frac{3}{8}+4-\frac{3}{8}=\frac{3}{8}-\frac{3}{8}+4=0+4=4\)
Hoặc \(\frac{3}{8}+2^2-\frac{3}{8}=\frac{3}{8}+4-\frac{3}{8}=\frac{3}{8}+\frac{32}{8}-\frac{3}{8}=\frac{35}{8}-\frac{3}{8}=\frac{32}{8}=4\)
\(X-\frac{2}{3}=2y+\frac{1}{4}=z-\frac{3}{5}\)
ko có đề sao làm
\(A=\frac{1}{2}-\left(\frac{1}{2}\right)^2+\left(\frac{1}{2}\right)^3-\left(\frac{1}{2}\right)^4+...-\left(\frac{1}{2}\right)^{20}\)
\(2A=1-\frac{1}{2}+\left(\frac{1}{2}\right)^2-\left(\frac{1}{2}\right)^3+...-\left(\frac{1}{2}\right)^{19}\)
\(2A-A=\)\(\left(1-\frac{1}{2}+\left(\frac{1}{2}\right)^2-\left(\frac{1}{2}\right)^3+...-\left(\frac{1}{2}\right)^{19}\right)-\)\(\left(\frac{1}{2}-\left(\frac{1}{2}\right)^2+\left(\frac{1}{2}\right)^3-\left(\frac{1}{2}\right)^4+...-\left(\frac{1}{2}\right)^{20}\right)\)
\(A=1-\left(\frac{1}{2}\right)^{20}\)
Có: 7-3.\(\frac{-1}{4}^2\)
= 7-3. \(\frac{1}{16}\)
= 7- \(\frac{3}{16}\)
= \(\frac{112}{16}\)-\(\frac{3}{16}\)
= \(\frac{109}{16}\)
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) \(x-\frac{1}{2}=2,5-x\)
\(x+x=2,5+\frac{1}{2}\)
\(2x=3\)
\(x=\frac{3}{2}\)
c) \(\left(x+\frac{1}{10}\right)+\left(x+\frac{1}{11}\right)=0\)
\(2x+\frac{21}{110}=0\)
\(2x=\frac{-21}{110}\)
\(x=\frac{-21}{110}:2\)
\(x=\frac{-21}{220}\)
1,
\(\frac{25}{12}+\left(\frac{-4}{12}\right)=\frac{7}{4}\)
\(\frac{-10}{8}+\frac{15}{4}=\frac{5}{2}\)
\(\frac{3}{8}+\frac{-14}{6}=\frac{-47}{24}\)
\(\frac{350}{150}+\left(\frac{-200}{360}\right)=\frac{16}{9}\)
\([\frac{5}{8}+\left(\frac{-3}{4}\right)]+\frac{15}{6}=\frac{-1}{8}+\frac{15}{6}=\frac{19}{8}\)
\(\frac{7}{3}+[\left(\frac{-5}{6}\right)+\left(\frac{-2}{3}\right)]=\frac{7}{3}+\left(\frac{-3}{2}\right)=\frac{5}{6}\)
\(\frac{1}{3}\times x+\frac{3}{4}\times x-75\%=\frac{-21}{4}\)
3/4- 1/2-x= 0,5
1/4- x=0,5
x=1/4-0,5
x=-1/4