a) $\left | -11\right |+ \left | 22 \right |+\left | -33 \right | -44$
= 11 + 22 + 33 - 44 = 22
b) $2\times \left | -21 \right |-3\times \left | 125\right |-5\times \left | -33\right |-\left | 2 \times 21 \right |$
= $2 \times21 - 3 \times125 - 5 \times33 - 42$
= 42 - 375 - 165 - 42 = - 540
c)$ 2.8 +3\times \left |- \frac{13}{3}\right |+0.2\times \left |6 \right |+5\times \left | -10\right |$
= $2.8 +3\times\frac{13}{3}+0.2\times6+5\times10 $
= 2.8 + 13 + 1.2 + 50 = 67
d) $(-1.5)+2\times \left | 2\frac{1}{2} \right |-6\times \left |\frac{-16}{3} \right |+5\times \left | -0.3 \right |$
=$ (-1.5)+2\times \frac{5}{2} -6\times\frac{16}{3} +5\times0.3$
= -1.5 + 5 - 32 + 1.5 = -27