Cho M= 17/5. -31/125. 1/2. 10/7. ( -1/2)^3 và

* Hướng dẫn giải

$M=\frac{17}{5}.\frac{-31}{125}.\frac{1}{2}.\frac{10}{17}.{\left(\frac{-1}{2}\right)}^3$

$M=\frac{17.\left(-31\right)\mathrm{.1.10.}{\left(-1\right)}^3}{{\mathrm{5.125.2.17.2}}^3}$

$M=\frac{-31.\left(-1\right)}{{125.2}^3}$

$M=\frac{31}{1000}$

$N=\left(\frac{17}{28}+\frac{28}{29}-\frac{19}{30}-\frac{20}{31}\right).\left(\frac{-5}{12}+\frac{1}{4}+\frac{1}{6}\right)$

$N=\left(\frac{17}{28}+\frac{28}{29}-\frac{19}{30}-\frac{20}{31}\right).\left(\frac{-5}{12}+\frac{3}{12}+\frac{2}{12}\right)$

$N=\left(\frac{17}{28}+\frac{28}{29}-\frac{19}{30}-\frac{20}{31}\right).$