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[9/10-(1/4+7/20)]÷4/5怎么用简便方法!
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[9/10-(1/4+7/20)]÷4/5怎么用简便方法!
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答案和解析
[9/10-(1/4+7/20)]÷4/5
=(9/10-1/4-7/20)÷4/5
=(18/20-7/20-5/20)×5/4
=3/10×5/4
=3/8
=(9/10-1/4-7/20)÷4/5
=(18/20-7/20-5/20)×5/4
=3/10×5/4
=3/8
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