a) (9\25-2.18):(3hs4/5+0,2) b)3\8.19hs1\3-3\8.33hs1\3 c)13\25+6\41-38\25+35\41-1\2

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   Giải thích các bước giải:

   \[\begin{array}{l}
   a)(\frac{9}{{25}} – 2.18):(3\frac{4}{5} + 0,2) = (\frac{9}{{25}} – 36):(\frac{{19}}{5} + \frac{1}{5}) = \frac{{ – 891}}{{25}}:4 = \frac{{ – 891}}{{100}}\\
   b)\frac{3}{8}.19\frac{1}{3} – \frac{3}{8}.33\frac{1}{3} = \frac{3}{8}(19\frac{1}{3} – 33\frac{1}{3}) = \frac{3}{8}.( – 14) = \frac{{ – 21}}{4}\\
   c)\frac{{13}}{{25}} + \frac{6}{{41}} – \frac{{38}}{{25}} + \frac{{35}}{{41}} – \frac{1}{2} = (\frac{{13}}{{25}} – \frac{{38}}{{25}}) + (\frac{6}{{41}} + \frac{{35}}{{41}}) – \frac{1}{2} =  – 1 + 1 – \frac{1}{2} = \frac{{ – 1}}{2}
   \end{array}\]

    

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