khó thấy quá bạn ơi

b)\(\left(2016.1017+2017.2018\right).\left(1+\frac{1}{2}:\frac{3}{2}-\frac{4}{3}\right)\)

\(\left(2016.2017+2017.2018\right)\left(1+\frac{1}{3}-\frac{4}{3}\right)\)

\(\left(2016.2017+2017.2018\right).\left(\frac{4}{3}-\frac{4}{3}\right)\)

\(\left(2016.2017+2017.2018\right).0\)

\(=0\)

a) \(1001.789+456.128.128-789+912.436\)

\(=\left(1001.789-789\right)+\left(456.2.64.128+912.436\right)\)

\(=789.1000+912.4\left(2048+109\right)\)

\(=789000+912.4.2157\)

\(=8657736\)

a)13/56

b)8/9

\(\frac{18}{11}+\left(\frac{7}{4}-\frac{3}{5}\right):\frac{1}{2}\)

\(\frac{18}{11}+\frac{23}{20}:\frac{1}{2}\)

\(\frac{18}{11}+\frac{23}{20}\times\frac{2}{1}\)

\(\frac{18}{11}+\frac{23}{10}\)

\(\frac{433}{110}\)

rồi, h thì dễ hỉu @@

\(\left(\frac{74}{7}+\frac{19}{5}\right)-\left(\frac{39}{7}-\frac{6}{5}\right)=\frac{74}{7}+\frac{19}{5}-\frac{39}{7}+\frac{6}{5}=\left(\frac{74}{7}-\frac{39}{7}\right)+\left(\frac{19}{5}+\frac{6}{5}\right)=\frac{35}{7}+\frac{25}{5}=5+5=10\)

trời ạ @@ chả thấy j` cả 

Ta có \(\left(x-\frac{1}{2}\right).\frac{5}{2}+\frac{1}{2}=\frac{7}{4}\)

\(\Rightarrow\left(x-\frac{1}{2}\right).\frac{5}{2}=\frac{7}{4}-\frac{1}{2}\)

\(\Rightarrow\left(x-\frac{1}{2}\right).\frac{5}{2}=\frac{5}{4}\)

\(\Rightarrow x-\frac{1}{2}=\frac{5}{4}\div\frac{5}{2}\)

\(\Rightarrow x-\frac{1}{2}=\frac{1}{2}\)

\(\Rightarrow x=1\)

(x-\(\frac{1}{2}\)).\(\frac{5}{2}\)+\(\frac{1}{2}\)=\(\frac{7}{4}\)

(x-\(\frac{1}{2}\)).\(\frac{5}{2}\)=\(\frac{7}{4}\)- \(\frac{1}{2}\)

(x-\(\frac{1}{2}\)).\(\frac{5}{2}\)= \(\frac{7}{4}\)- \(\frac{2}{4}\)

(x-\(\frac{1}{2}\)).\(\frac{5}{2}\)\(\frac{5}{2}\)= \(\frac{5}{4}\)

(x-\(\frac{1}{2}\)) = \(\frac{5}{4}\): \(\frac{5}{2}\)= \(\frac{5}{4}\). \(\frac{2}{5}\)= \(\frac{1}{2}\)

x = \(\frac{1}{2}\)+ \(\frac{1}{2}\)=\(\frac{1}{4}\)

vậy x\(\frac{7}{4}\)\(\frac{7}{4}\)