Fraction - fraction = half fraction + fraction = half

Fraction - fraction = half fraction + fraction = half

A: 2 / 3-1 / 6 = 1 / 2,
1 / 3 + 1 / 6 = half

1. The store has four fifths of the tons of food, one third of which is sold on the first day, one fifth on the second day, and how many percent is left
2. Can 7 / 13 + 3 / 4 - 6 / 13 simple calculation be used
3. Xiaoqiang read a story book. On the first day, he read two fifths of the book, and on the second day, he read one third of the book. How many parts of the book are left
4. Xiao Ming has walked 3000 meters from home to school. The distance he has walked is one fourth of a kilometer less than the rest. How many kilometers does Xiao Ming have from home to school
Come on, it's coming today

4 / 5 × (1-1 / 3-1 / 5) = 4 / 5 × 7 / 15 = 28 / 75 ton 2. 7 / 13 + 3 / 13 - 6 / 13 can you use 7 / 13 + 3 / 4-6 / 13 = 7 / 13-6 / 13 + 3 / 4

A box of apples weighs 20 kg. I ate two fifths of the boxes in the first week, a quarter of the boxes in the second week, and how many boxes are left
There's another question. I'll give you 15 points for who can get it.
There are 63 Chinese paintings. Sketch is one ninth more than traditional Chinese painting, and how many copies more than traditional Chinese painting

1-2/5-1/4
=20/20-8/20-5/20
=7/20
A: seven out of 20 cartons left