"сравнение"
472+(41+26)=(472+41)+26
472+67=513+26
539=539
41+26=67 = 472+41=513
472+67=539. 513+26=539
"сравнение"
472+(41+26)=(472+41)+26
472+67=513+26
539=539
41+26=67 = 472+41=513
472+67=539. 513+26=539