1) (4752+6840): 72=2) 9280-33048:54=

1) (4752+6840): 72=11592:72=161 4752 11592 l___72_+- 72 l 1616840 _________ 439 11592 — 432 _____ 72 -72 ______ 0 2) 9280-33048:54=9280 — 612=8668 33048 l___ 54__ 9280 -324 l 612 — 612 ____ _____ 8668 64 -54 _______ 108 -108________ 0