\(39,52-23,48+20,48-56,52\)
\(=\left(39,52-26,52\right)-\left(23,48-20,48\right)\)
\(=3-3\)
\(=0\)
\(39,52-23,48+20,48-26,52\\ =\left(39,52-26,52\right)+\left(-23,48+20,48\right)\\ =13-3\\ =10.\)
\(39,52-23,48+20,48-26,52\)
\(=\left(39,52-26,52\right)-\left(23,48-20,48\right)\)
\(=13-3\)
\(=10\)