1. 1 1 times 2 3/5 = 3/2 *13/5 = 39/10 = 310.9 meters.

2.2/5 times 1 and1= 2/5 * 5/4 =1/2 =1m.

3.3 1/2 1 times 2/5 times 3/4 = 7/2 * 2/5 * 3/4 = 2 1/20 =1and1kg of 20.

4.48*( 1-3/8)=48*5/8=30 people.

5.60x 65438+7x 3 = 60 * 7/ 12 * 3 = 35 * 3 = 105。