la+3l+lb-2l+c+1l=0求a+b+c
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la+3l+lb-2l+c+1l=0求a+b+cla+3l+lb-2l+c+1l=0求a+b+cla+3l+lb-2l+c+1l=0求a+b+c|a+3|+|b-2|+|c+1|=0说明a+3=0;b
la+3l+lb-2l+c+1l=0求a+b+c
la+3l+lb-2l+c+1l=0求a+b+c
la+3l+lb-2l+c+1l=0求a+b+c
|a+3|+|b-2|+|c+1|=0说明
a+3=0 ; b-2=0 ; c+1=0
所以 a = -3 ,b = 2 ; c = -1
所以 a+b+c = - 3 + 2 - 1 = - 2
la+3l+lb-2l+c+1l=0求a+b+c
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