口算1.4:21＝,口算1.4:21＝,口算1.4:21＝,快,

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口算1.4:21＝,口算1.4:21＝,口算1.4:21＝,快,

口算1.4:21＝,口算1.4:21＝,口算1.4:21＝,快,
口算1.4:21＝,口算1.4:21＝,口算1.4:21＝,快,

口算1.4:21＝,口算1.4:21＝,口算1.4:21＝,快,
1.4∶21=0.2∶3=0.1∶1.5=1∶15

1.4:21=7:105

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