已知|a|="5,|b|=2,ab" <0.求:3a +2b 的值 .
解:∵|a|=5,∴a =_______.
∵|b|=2,∴b =_______.
∵ab <0,∴当a =_______时,b =_______,
当a =_______时,b=_______.
∴3a +2b =_______或3a +2b =_______.
∴3a +2b 的值为_______.
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已知|a|="5,|b|=2,ab" <0.求:3a +2b 的值 .
解:∵|a|=5,∴a =_______.
∵|b|=2,∴b =_______.
∵ab <0,∴当a =_______时,b =_______,
当a =_______时,b=_______.
∴3a +2b =_______或3a +2b =_______.
∴3a +2b 的值为_______.