od sumy liczb 1 2/5 i  3 1/4 odejmij iloczyn 4 4/5 i 3 3/5 do iloczynu liczb 1 2/3 i 2/5 dodaj iloraz liczb 4 4/5 i 1 1/6

(1 2/5+3 1/4) - (4 4/5 * 3 3/5) = (12/5+13/4)-(24/5*18/5) = (48/20+65/20)-432/25 = 113/20-432/25 = 565/100 - 1728/100 = - 1163/100 = - 11,63 (1 2/3 * 2/5) + (4 4/5 :1 1/6) = (5/3*2/5)+(24/5:7/6) = 2/3 + (24/5*6/7) = 2/3+144/35 = 70/105+432/105 = 502/105 = 4 82/105