1. [tex]2-1.3- \frac{1}{2}=2- \frac{13}{10}- \frac{1}{2}= \frac{20-13-5}{10}= \frac{2}{10}= \frac{1}{5} [/tex] ≈0.2
2. [tex]1* \frac{1}{4}*1* \frac{1}{3} = \frac{1}{12} [/tex] ≈0.0833333
3. [tex](2* \frac{1}{5}-0.4+ \frac{1}{45}):(1* \frac{1}{3}) ^{2} = (\frac{2}{5}- \frac{2}{5} + \frac{1}{45}):( \frac{1}{3}) ^{2}= \frac{1}{45} : \frac{1}{9}=\frac{1}{45} *9= \frac{1}{5} [/tex] ≈0.2
