The definition of rational number operation △ is as follows: a △ B = [a + b] minus [A-B], find [negative 3] △ 4

The definition of rational number operation △ is as follows: a △ B = [a + b] minus [A-B], find [negative 3] △ 4


(-3+4)-(-3-4)
=1+7
=8



2 / 15 of 5 / 9 tons is equal to 1 / 3 of () tons?


2 / 15 of 5 / 9 tons is equal to 1 / 3 of (2 / 9) tons
5/9×2/15÷1/3=2/9
(two out of nine)



What is 9 out of 25 + 9 out of 50 + 1 out of 4


9 / 25 + 9 / 50 + 1 / 4
=18/50+9/50+1/4
=27/50+1/4
=54/100+25/100
=79/100