1.120X3/4=90米 120-90=30米
2.4/5X1/2=2/5 4/5x1/5=4/25 4/5-2/5-4/25=2/5-4/25=10/25-4/25=6/25
3.2400x1/3=800m 2400-2400x1/3=1600m
4.男:450x3/5=270 女:450-450X3/5=180
5.250x1/5=50
6.150x3/5=60
1.120X3/4=90米 120-90=30米
2.4/5X1/2=2/5 4/5x1/5=4/25 4/5-2/5-4/25=2/5-4/25=10/25-4/25=6/25
3.2400x1/3=800m 2400-2400x1/3=1600m
4.男:450x3/5=270 女:450-450X3/5=180
5.250x1/5=50
6.150x3/5=60