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1 phần 2 nhân 3 phần 4 cộng 1 phần 2 nhân 1 phần 4 ; 11 phần 3 nhân 26 phần 7 trừ 20 phần 7 nhân 8 phần 30
\(a,\frac{3}{17}+\frac{-5}{13}+\frac{-18}{35}+\frac{14}{17}+\frac{17}{-35}\)
=\(-\frac{5}{13}+\left(\frac{3}{17}+\frac{14}{17}\right)+\left(\frac{-18}{35}+\frac{-17}{35}\right)\)
= \(-\frac{5}{13}+1+\left(-1\right)\)
=\(-\frac{5}{13}\)
\(b,\frac{-3}{8}.\frac{1}{6}+\frac{3}{-8}.\frac{5}{6}+\frac{-10}{6}\)
=\(\frac{-3}{8}.\left(\frac{1}{6}+\frac{5}{6}\right)+\frac{-10}{6}\)
=\(\frac{-3}{8}.1+\frac{-10}{6}\)
=\(-\frac{49}{24}\)
\(c,\frac{-4}{11}.\frac{5}{15}.\frac{11}{-4}\)
=\(\left(\frac{-4}{11}.\frac{11}{-4}\right).\frac{1}{3}\)
=\(1.\frac{1}{3}=\frac{1}{3}\)
\(d,\frac{13}{8}+\frac{1}{8}:\left(0,75-\frac{1}{2}\right)-25\%.\frac{1}{2}\)
=\(\frac{13}{8}+\frac{1}{8}:\left(\frac{3}{4}-\frac{1}{2}\right)-\frac{1}{4}.\frac{1}{2}\)
=\(\frac{13}{8}+\frac{1}{8}:\frac{1}{4}-\frac{1}{8}\)
=\(\frac{13}{8}+\frac{1}{2}+\frac{-1}{8}\)
=\(\left(\frac{13}{8}+\frac{-1}{8}\right)+\frac{1}{2}\)
=\(\frac{3}{2}+\frac{1}{2}=2\)
\(e,\frac{-1}{2^2}-\left(-2\right)^2-5\)
=\(\frac{-1}{4}-4-5\)
=\(-\frac{37}{4}\)
\(f,\frac{121}{3}-\frac{5}{7}:\left(24-\frac{23}{57}\right)\)
=\(\frac{121}{3}-\frac{5}{7}:\frac{1345}{57}\)
=\(\frac{121}{3}-\frac{57}{1883}\)
\(\approx40,4\)
a)\(\frac{9}{6}+\frac{7}{24}=\frac{36}{24}+\frac{7}{24}=\frac{36+7}{24}=\frac{43}{24}\)
b)\(\frac{-5}{7}+\frac{8}{14}=\frac{-10}{14}+\frac{8}{14}=\frac{-10+18}{14}=\frac{8}{14}\)\(=\)\(\frac{4}{7}\)
c)\(\frac{-7}{6}+\left(-2\right)=\frac{-7}{6}+\frac{-2}{1}=\frac{-7}{6}+\frac{-12}{6}=\frac{-7+\left(-12\right)}{6}=\frac{-19}{6}\)
d)\(\frac{-50}{300}+\frac{-40}{200}=\frac{-10000}{60000}+\frac{-12000}{60000}=\frac{-10000+\left(-12000\right)}{60000}=\frac{-22000}{60000}\)
\(1,4.\frac{5}{35}-\frac{2}{9}:\left(\frac{7}{6}-50\%\right)\)
\(=\frac{1}{5}-\frac{2}{9}:\frac{2}{3}\)
\(=\frac{1}{5}-\frac{1}{3}\)
\(=-\frac{2}{15}\)
\(1,4.\frac{5}{35}-\frac{2}{9}:\left(\frac{7}{6}-50\%\right)\)
\(=\frac{1}{5}-\frac{2}{9}:\frac{2}{3}\)
\(=\frac{1}{5}-\frac{1}{3}\)
\(=\frac{-2}{15}\)
Study well ! >_<