Espressioni di monomin.143 e 144

143)

$\small \dfrac{2}{3}ab+\dfrac{3}{2}a-\dfrac{1}{6}ab-(-a)-\dfrac{5}{2}a+(-2ab)=$

$\small = \dfrac{2}{3}ab+\dfrac{3}{2}a-\dfrac{1}{6}ab+a-\dfrac{5}{2}a-2ab =$

$\small = \left(\dfrac{2}{3}-\dfrac{1}{6}-2\right)ab+\left(\dfrac{3}{2}+1-\dfrac{5}{2}\right)a =$

$\small = \left(\dfrac{4-1-12}{6}\right)ab+\left(\dfrac{3+2-5}{2}\right)a =$

$\small = \left(-\dfrac{\cancel9^3}{\cancel6_2}\right)ab+\dfrac{0}{2}a =$

$\small = -\dfrac{3}{2}ab+0a =$

$\small = -\dfrac{3}{2}ab$

2ab/3 - ab/6 - 2ab + 3a/2 + a - 5a/2

ab(4-1-12)/6 + a(3+2-5)/2

-9ab/6

-3ab/2

a^3/4-a^3+7a^3/2 - 2abc - 2abc/3 + 4abc/9

a^3(1-4+14)/4 + abc(-18-6+4)/9

11a^3/4 - 20abc/9

144)

$\small \dfrac{1}{4}a^3-2abc+\left(-\dfrac{2}{3}abc\right)-a^3-\left(-\dfrac{7}{2}a^3\right)+\dfrac{4}{9}abc =$

$\small = \dfrac{1}{4}a^3-2abc-\dfrac{2}{3}abc-a^3+\dfrac{7}{2}a^3+\dfrac{4}{9}abc =$

$\small = \left(\dfrac{1}{4}-1+\dfrac{7}{2}\right)a^3+\left(-2-\dfrac{2}{3}+\dfrac{4}{9}\right)abc =$

$\small = \left(\dfrac{1-4+14}{4}\right)a^3+\left(\dfrac{-18-6+4}{9}\right)abc =$

$\small = \dfrac{11}{4}a^3+\left(-\dfrac{20}{9}\right)abc =$

$\small = \dfrac{11}{4}a^3-\dfrac{20}{9}abc $