已知有理数a,b,c满足丨b丨=-b,丨a丨=-2a,丨a+c丨*c=1,化简丨3a-b丨-丨-b+c+2丨.
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![已知有理数a,b,c满足丨b丨=-b,丨a丨=-2a,丨a+c丨*c=1,化简丨3a-b丨-丨-b+c+2丨.](/uploads/image/z/3153232-64-2.jpg?t=%E5%B7%B2%E7%9F%A5%E6%9C%89%E7%90%86%E6%95%B0a%2Cb%2Cc%E6%BB%A1%E8%B6%B3%E4%B8%A8b%E4%B8%A8%3D-b%2C%E4%B8%A8a%E4%B8%A8%3D-2a%2C%E4%B8%A8a%2Bc%E4%B8%A8%2Ac%3D1%2C%E5%8C%96%E7%AE%80%E4%B8%A83a-b%E4%B8%A8-%E4%B8%A8-b%2Bc%2B2%E4%B8%A8.)
已知有理数a,b,c满足丨b丨=-b,丨a丨=-2a,丨a+c丨*c=1,化简丨3a-b丨-丨-b+c+2丨.
已知有理数a,b,c满足丨b丨=-b,丨a丨=-2a,丨a+c丨*c=1,化简丨3a-b丨-丨-b+c+2丨.
已知有理数a,b,c满足丨b丨=-b,丨a丨=-2a,丨a+c丨*c=1,化简丨3a-b丨-丨-b+c+2丨.
根据题目知:b是非正数,a=0,c=1
则原题=I-bI-I-b+3I
=-b-(3-b)
=-b-3+b
=-3
b≤0,a=0,c=1
原式=-b-(3-b)=-3
原式=-b-[-(-b+3)]=-2b+3