6cm vuông=...mm vuông 30km vuông=...hm vuông 8m vuông=...cm vuông 200mm vuông=...cm vuông 4000dm vuông=...m vuông 34000hm vuông=...km vuông 260cm vuông=...dm vuông... cm vuôn 1086m vuông=...dam vuông... m vuông Giải giúp mk bài 8,9 với bài trên nha Ai làm đc mk cho 5 sao

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