80000 – 50000 = 30000 70000 – 60000 = 1000090000 – 70000 = 20000...

Câu 1.80000 – 50000 = 30000 70000 – 60000 = 1000090000 – 70000 = 20000 100000 – 90000 = 1000060000 – 20000 = 40000 100000 – 30000 = 70000