Tính:
80000 – 50000 = ....
90000 – 70000 = ...
60000 – 20000 = ...
70000 - 60000 = ...
100000 - 90000 = ...
100000 – 30000 = ...
80000 – 50000 = 30000
90000 – 70000 = 20000
60000 – 20000 = 40000
70000 – 60000 = 10000
100000 – 90000 = 10000
100000 – 30000 = 70000
-- Mod Toán lớp 3
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