若a、b、c是有理数,且有|a|=1,|b-2|+(3a+2c)=0,试求式子abc/a+b+c的值
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人气:473 ℃ 时间:2020-04-04 13:24:13
解答
题目应该有错误(3a+2c)应该是(3a+2c)²
|a|=1,则a=1或-1
由|b-2|+(3a+2c)²=0可知,
|b-2|=0,(3a+2c)=0
b=2
a=1时,c=-3/2
a=-1时,c=3/2
代入abc/a+b+c得-2.5或6.5
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