20.5-0.5*(7-2.1)简便

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20.5-0.5*(7-2.1)简便20.5-0.5*(7-2.1)简便20.5-0.5*(7-2.1)简便20.5-0.5*4.9=20.5-2.45=18.05

20.5-0.5*(7-2.1)简便
20.5-0.5*(7-2.1)简便

20.5-0.5*(7-2.1)简便
20.5-0.5*4.9=20.5-2.45=18.05