tổng hai số là:15x2=30

tổng số phần bằng nhau là:1+2=3

số bé là:30:3x1=10

số lớn là:10x2=20

Hanoi is the capital of Vietnam. Nowaday, the traffic problem is a serious issue that needs to be solved immediately in many countries around the world. There have been many seminars opened to discuss a problem, which is a traffic problem. One of the traffic problems in our big cities is that there are to many people using the road. Another traffic problem is the roads in VN is not as big and clean as the roads in the big countries. They're narrow, bumpy and some dirty so it’s really hard for the road users to drive safely. One more dangerous problem is that there are accidents everyday because too many people not respect and don’t follow the traffic rules. That’s the biggest reason for everything. They wear the helmet that not strong enough to keep they safe if the accident may happen, they ride too fast on the small roads… The traffic will never can be improve if they keep doing this. Beside, the young people are riding their bike dangerously they even play on the street with their motors. However, in some countries around the world the traffic problem has been solved and Vietnam is trying to overcome this problem to minimize the number of traffic accidents to the lowest level.