a. x+1975-4329=2223; ×+1975=2223+4329; ×+1975=6552; ×=6552- 1975;×=4577
b. 3847+x-9647=18542; 3847+x=18542-9647; 3847+x=8895; x=8895-3847=5048
c.8598-x-2543=1847; 8598-x=1847+2543; 8598-x=4390; 8598-4390=x; x=4208
problema:
846+584=1430 lei( Dan+ Matei)
2000-1430=570 lei ( are Dan)