( 41959 - 19 ) • 800 : 45 + 7840 =
1)41959-19=41940 2)41959•800=3355200 3)3355200:45=745600 4)745600+7840=753440
41959-19=41940 41940•800=33552000 33552000:45=745600 745600+7840=753440