Answer :

a) -3 + (-1.5) = -3 - 1.5 = - (3 + 1.5) = -4.5

3

+

1.5

--------

4.5

b) -2 1/2 = -(2*2 + 1)/2 = -5/2

[tex]-\frac{5}{2}+\frac{2}{3}=\text{ }\frac{-5\cdot3\text{ + 2}\cdot2}{2\cdot3}=\frac{-15+4}{6}=\frac{-11}{6}[/tex]

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