9千米=______米; | 4000千克=______吨; | 60毫米=______厘米; | 80厘米=______分米; | 50分米=______米; | 2000克=______千克; | 6米=______厘米; | 7分米=______毫米; | 28毫米+52毫米=______毫米=______厘米; | 9厘米+31厘米=______厘米=______分米; | 3米-25分米=______分米; | 40米÷______=5; | 600千克+1400千克=______吨; | 30米÷6=______分米; | 3吨-800千克=______千克; | 4分米×5=______米. |
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