∵a>0>b
∴-b>0
∴2a-b>0
∴|2a-b|=2a-b
若a>0>b,且丨a丨>丨b丨,則丨2a-b丨去絕對值符號應(yīng)為
若a>0>b,且丨a丨>丨b丨,則丨2a-b丨去絕對值符號應(yīng)為
數(shù)學(xué)人氣:827 ℃時間:2019-12-18 20:54:24
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