a,\(\frac{3}{2}\cdot\frac{7}{3}+\frac{4}{3}\cdot\frac{1}{2}\)=\(\frac{7}{2}+\frac{2}{3}\)=\(\frac{25}{6}\)
b,\(\frac{2}{145}\cdot\left(\frac{1}{9}-\frac{13}{3}+1\right)\)=\(\frac{2}{145}.-\frac{29}{9}=-\frac{2}{45}\)
c.\(\frac{15}{7}:\left(-\frac{31}{12}-\frac{1}{18}-\frac{20}{9}\right)\)=\(\frac{15}{7}:\left(-\frac{175}{36}\right)=-\frac{108}{245}\)
\(1\frac{1}{2}.2\frac{1}{3}+1\frac{1}{3}.\frac{1}{2}\)
\(=\frac{3}{2}.\frac{7}{3}+\frac{4}{3}.\frac{1}{2}\)
\(=\frac{7}{2}+\frac{2}{3}\)
\(=\frac{25}{6}\)
\(\frac{1}{9}.\frac{2}{145}-4\frac{1}{3}.\frac{2}{145}+\frac{2}{145}\)
\(=\frac{2}{1305}-\frac{13}{3}.\frac{2}{145}+\frac{2}{145}\)
\(=\frac{2}{1305}-\frac{26}{435}+\frac{2}{145}\)
\(=\frac{-2}{45}\)
\(\left(-2\frac{7}{12}\right):2\frac{1}{7}-\frac{1}{18}:2\frac{1}{7}+2\frac{2}{9}:2\frac{1}{7}\)
\(=\frac{-17}{12}:\frac{15}{7}-\frac{1}{18}:\frac{15}{7}+\frac{20}{9}:\frac{15}{7}\)
\(=\left(\frac{-17}{2}-\frac{1}{18}+\frac{20}{9}\right):\frac{15}{7}\)
\(=\frac{-19}{3}.\frac{7}{15}\)
\(=\frac{-133}{45}\)
học tốt
a, 1 1/2 . 2 1/3 + 1 1/3 . 1/2
=77/2+11/6
=121/3
a, 11/2 . 21/3 + 11/3 . 1/2 = 11/2 . 7 + 11/6
= 77/2 + 11/6
= 121/3
b, 1/9 . 2/145 - 41/3 . 2/145 + 2/145 = 2/1305 - 82/435 + 2/145
= -226/1305
c, (-27/12) : 21/7 - 1/18 : 21/7 + 22/9 : 21/7 = -9/7 . 7/21 - 1/18 . 7/21 + 22/9 . 7/21
= -9/4 . 1/3 - 1/18 . 1/3 + 22/9 . 1/3
= -3/4 - 1/54 + 22/27
= 5/108
