sos!help!help!若a
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sos!help!help!若asos!help!help!若asos!help!help!若a首先a-(-a)=2a而2a是负数所以绝对值为正数-2a答案选C
sos!help!help!若a
sos!help!help!
若a
sos!help!help!若a
首先a-(-a)=2a
而2a是负数
所以绝对值为正数-2a
答案选C
sos!help!help!若a
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