B=(-3 + \(\frac{3}{4}\)-\(\frac{1}{3}\)):(5 + \(\frac{2}{5}\)-\(\frac{2}{3}\))

C=(​​\(\frac{3}{5}\)-\(\frac{4}{15}\))(\(\frac{2}{7}\)-\(\frac{3}{14}\)) - (\(\frac{5}{9}\)-\(\frac{7}{27}\))(1 - \(\frac{3}{5}\)) + (1 - \(\frac{11}{12}\))(1 + \(\frac{11}{12}\))

Sap xep cac ket qua trong cac gia tri duoi day tu be den lon

a,  \(x-\frac{2}{7}=\frac{8}{21}\)

b,\(\frac{7}{4}-\)\(\left[\frac{2}{3}-\left(\frac{1}{2}-\frac{3}{8}\right)\right]\)

c, \(\frac{11}{13}-\left(\frac{5}{42}+x\right)=-\frac{15}{28}+\frac{11}{13}\)

d, \(x^4=16\)

e,\(\frac{3}{4}-\)\(\left[-\left(-\frac{5}{3}\right)-\left(\frac{1}{12}+\frac{2}{9}\right)\right]\)

g,gia tri bieu thuc \(\left(\frac{1}{5}+\frac{1}{8}+\frac{3}{8}\right)+x\) tai \(x=\frac{-1}{2}\)

h,\(\frac{1}{11}+\frac{2}{3}+\frac{-19}{33}\)

i,  gia tri x thoa man \(\frac{-\left(-x\right)}{5}-\frac{2}{10}=\frac{1}{-5}-\frac{7}{50}\)

k,\(\frac{-6}{11}+\frac{12}{-7}+\frac{-33}{77}\)

l,\(\left(\frac{1}{6}+\frac{1}{10}-\frac{1}{15}\right)+x=0\)

m,\(-\frac{2}{5}\le x-\frac{7}{5}<\frac{3}{5}\)

n,\(x+\left(-\frac{3}{10}+\frac{5}{12}-\frac{4}{5}\right)tai\) \(x=-\frac{1}{3}\)

bài 1:  a) \(\frac{-7}{12}\) + \(\frac{11}{20}\) - \(\frac{8}{15}\)

b) \(\frac{9}{11}\) +\(\left(\frac{-2}{5}+\frac{1}{6}\right)\) :\(\frac{11}{30}\)

c) \(\frac{-17}{25}.\frac{20}{33}+\frac{-17}{25}.\frac{13}{33}+\frac{-3}{25}\)

bài 2.

a) \(\frac{3}{5}.\frac{4}{9}+\frac{-3}{10}.\frac{4}{9}+1\frac{3}{10}\)

b) 0,7 + \(\frac{8}{5}\) : 3 - \(\frac{7}{30}\)

bài 3.

a) \(\frac{13}{30}+\frac{11}{20}-\frac{7}{15}\)

b) \(\frac{-5}{72}:\left(\frac{3}{8}.\frac{7}{9}\right)\)

c) \(\frac{-23}{25}.\frac{10}{13}+\frac{-23}{25}.\frac{3}{13}+\frac{-27}{25}\)

Tính:

a) (\(\frac{-2}{3}+\frac{3}{7}\)) : \(\frac{4}{5}+\)(\(\frac{-1}{3}+\frac{4}{7}\)) : \(\frac{4}{5}\)

b) \(\frac{5}{9}\): (\(\frac{1}{11}-\frac{5}{22}\)) +\(\frac{5}{9}\): ( \(\frac{1}{15}-\frac{2}{3}\))

1. Tính nhanh:

a) A= \(\frac{1}{5}\)- \(\frac{3}{7}\)+ \(\frac{5}{9}\)- \(\frac{2}{11}\)+ \(\frac{7}{13}\)- \(\frac{9}{16}\)- \(\frac{7}{13}\)+ \(\frac{2}{11}\)- \(\frac{5}{9}\)+ \(\frac{3}{7}\)- \(\frac{1}{5}\)

Tính nhanh

a)\(\frac{1}{3}\)-\(\frac{3}{4}\)-( -\(\frac{3}{5}\)) +\(\frac{1}{64}\)-\(\frac{2}{9}\)-\(\frac{1}{36}\)+\(\frac{1}{15}\)

b)\(\frac{1}{3}\)-\(\frac{3}{5}\)+\(\frac{5}{7}\)-\(\frac{7}{9}\)+\(\frac{9}{11}\)-\(\frac{11}{13}\)+\(\frac{13}{15}\)+\(\frac{11}{13}\)-\(\frac{9}{11}\)-\(\frac{5}{7}\)+\(\frac{3}{5}\)-\(\frac{1}{3}\)

c)\(\frac{1}{99}\)-\(\frac{1}{99.98}\)-\(\frac{1}{98.97}\)-\(\frac{1}{97.96}\)-...-\(\frac{1}{3.2}\)-\(\frac{1}{3.1}\)

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