Đề bài

Tính: a) \(324,82 + 312,25;\) c) \(\left( { - 41,29} \right) - 15,34;\) b) \(\left( { - {\rm{ }}12,07} \right) + \left( { - 5,79} \right);\) d) \(\left( { - {\rm{ }}22,65} \right) - \left( { - 1,12} \right).\)

Lời giải chi tiết

\(\begin{array}{*{20}{l}}{a){\rm{ }}324,82 + 312,25 = 637,07}\\{b){\rm{ }}\left( { - {\rm{ }}12,07} \right) + \left( { - {\rm{ }}5,79} \right) =  - \left( {{\rm{ }}12,07 + 5,79} \right) =  - 17,86}\\\begin{array}{l}c){\rm{ }}\left( { - {\rm{ }}41,29} \right) - 15,34{\rm{ }} = \left( { - {\rm{ }}41,29} \right) + \left( { - 15,34} \right)\\ =  - \left( {{\rm{ }}41,29 + 15,34} \right) =  - 56,63\end{array}\\{d){\rm{ }}\left( { - {\rm{ }}22,65} \right) - \left( { - {\rm{ }}1,12} \right) = \left( { - {\rm{ }}22,65} \right) + {\rm{ }}1,12 =  - 21,53\;}\end{array}\)

ufa999.cc