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
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