134572+403648=538220
428050-283764=144286
569000-273825=295175
2)7x8=56
9x6=54
11x7=77
321x25=8025
208x60=12480
583x300=174900
3)28:7=4
63:9=7
25:5=5
125:3=41,(6)7
368:8=46
4.)153458+a=297020
a=297020-153458
a=143562
v:153458+143562=297020
348043-b=152564
b=348043-152564
b=195479
V:348043-195479=152564
