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a b互為倒數cd互為相反數丨m丨等於2即a*b=1,c+d=0,m=正負2 則原式可化簡為1/5+0-m=1/5-m 當m=2時原式=1/5-2=-1.8 當m=-2時原式=1/5-(-2)=1/5+2=2.2
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