A. 7618 = 7000 + 600 + 10 + 81942 = 1000 + 900 + 40 + 29274 = 90...

Câu 3.a. 7618 = 7000 + 600 + 10 + 81942 = 1000 + 900 + 40 + 29274 = 9000 + 200 + 70 + 45076 = 5000 + 70 + 64404 = 4000 + 400 + 42005 = 2000 + 5b. 5000 + 700 + 20 + 4 = 57246000 + 800 + 90 + 5 = 68955000 + 500 + 50 + 5 = 55552000 + 400 = 24002000 + 20 = 20202000 + 7 = 2007