急急急急~~求求各位亲了 已知a>0,b<0且IbI>a,化简Ia+bI-Ia-bI-I-a-bI-Ib-aI=?

日期:2011-01-09 20:26:30 人气:1

急急急急~~求求各位亲了 已知a>0,b<0且IbI>a,化简Ia+bI-Ia-bI-I-a-bI-Ib-aI=?

Ia+bI-Ia-bI-I-a-bI-Ib-aI = b-a -(a-b)-(-b+a)-(a-b) = b-a -a +b +b -a -a +b = -4(a+b)
    A+
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