Toán Lớp 5: So sánh hai phân số 2005/2007 và 2007/2009
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Toán Lớp 5: So sánh hai phân số 2005/2007 và 2007/2009
Comments ( 2 )
1-2005/2007=2007/2007-2005/2007=2/2007
1-2007/2009=2009/2009-2007/2009=2/2009
Ta có:
2007<2009
=>2/2007>2/2009
=>2005/2007<2007/2009
Vậy 2005/2007<2007/2009
1−2005/2007=2007/2007−2005/2007=2007-2005/2007
1−2007/2009=2009/2009−2007/2009=2009-2007/2009
Ta có:
2007<2009/2007<2009
⇒2007>2009⇒2007>2009
⇒2005/2007<2007/2009⇒2005/2007<2007/2009
Vậy 2005/2007<2007/2009