用简便计算,
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用简便计算,
用简便计算,
用简便计算,
6.75×0.25-2.75÷4
=6.75×0.25-2.75×1/4
=6.75×0.25-2.75×0.25
=(6.75-2.75)×0.25
=4×0.25
=1