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Five answers to the application problems of fractional addition and subtraction mixed operation
1. The road construction team paved a road, covering 3/ 10 in the first half of May and 3/5 in the second half of May. How many places on this road are unpaved?

1-(3/ 10+3/5)= 1/ 10

A pile of apples weighs 30 tons. Car A can transport 1/6 at a time, and car B can transport 2/9 at a time. How many fractions of this pile of apples can two cars carry at a time?

1-(2/9+ 1/6)= 1 1/ 18

Xiao Li read a 350-page book. On the first day, he read two-fifths of the books, on the second day, he read three-sevenths of the books, and on the third day, he finished reading all the books. How much did he read on the third day?

1-(2/5+3/7)=6/35

There is a piece of bronze which is made of copper, tin and zinc. Where copper accounts for 4/5 of the total weight, tin accounts for 1/20 of the total weight, and zinc accounts for a fraction of the total weight?

1-(4/5+ 1/20)=3/20

The students picked up the ears of wheat. The first group picked up 4/5 kg, the second group picked up 1/4 kg less than the first group, and the third group picked up 1/3 kg more than the second group. How many kilograms did the third group take?

4/5- 1/4+ 1/3=53/60