若a大于0,b小于0,c大于0,化简丨2a丨+丨3b丨-丨a+c丨
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![若a大于0,b小于0,c大于0,化简丨2a丨+丨3b丨-丨a+c丨](/uploads/image/z/4498695-63-5.jpg?t=%E8%8B%A5a%E5%A4%A7%E4%BA%8E0%2Cb%E5%B0%8F%E4%BA%8E0%2Cc%E5%A4%A7%E4%BA%8E0%2C%E5%8C%96%E7%AE%80%E4%B8%A82a%E4%B8%A8%2B%E4%B8%A83b%E4%B8%A8-%E4%B8%A8a%2Bc%E4%B8%A8)
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若a大于0,b小于0,c大于0,化简丨2a丨+丨3b丨-丨a+c丨
若a大于0,b小于0,c大于0,化简丨2a丨+丨3b丨-丨a+c丨
若a大于0,b小于0,c大于0,化简丨2a丨+丨3b丨-丨a+c丨
| 2a | + | 3b | - | a + c |
= 2a - 3b - (a + c)
= 2a - 3b - a - c
= a - 3b - c