請問有其他方法可以解嗎？ - Clearnote

Mathematics

Senior High

Resolved

over 9 yearsago

請問有其他方法可以解嗎？

數與式

Answers

✨ Best Answer ✨

over 9 yearsago

|a|+|b|+|c|>|a+b+c|
推得三數一定有一正一負
又a>b>c
推得a一定為正 c一定為負
所以ac<0

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